BLUE LAKE HOA ABRORICULTRUAL MANAGEMENT...Ash, Dogwood, Elm, Euonymus, Pine. Rose Tip Moths Larve feed on new shoots killing the shoot Pine, White Pine Weevil Larve feed on new shoots

SEPTEMBER 2017

PREPARED BY: ANDREW PLENINGER

1111 Village Road, Carbondale CO 81623 (970) 063‐3070

BLUE LAKE HOAABRORICULTRUAL MANAGEMENT

PLAN

TABLE OF CONTENTS

Introduction & Purpose .......................................................................................................................................... 4

Abroricultural Needs & Treatments........................................................................................................................ 4

Water ................................................................................................................................................................. 4

Watering Prescription .................................................................................................................................... 4

Managing Soil Moisture .................................................................................................................................. 5

Water Quality ................................................................................................................................................. 6

Soils ................................................................................................................................................................... 6

Poor Drainage ................................................................................................................................................ 6

Build the Top Soil ........................................................................................................................................... 7

Insect Pests & Disease ........................................................................................................................................ 7

Treatments .................................................................................................................................................... 8

Physical Damage ................................................................................................................................................ 9

Treatments .................................................................................................................................................... 9

Other Plant Health Treatments ........................................................................................................................ 10

Pruning ........................................................................................................................................................ 10

Staking ......................................................................................................................................................... 10

Tree Removal ............................................................................................................................................... 10

Professional Tree & Lanscape Services ............................................................................................................. 10

Tree Survey Methodologies, Findings & Recommendations ................................................................................. 12

Methodologies ................................................................................................................................................. 12

Management Survey .................................................................................................................................... 12

Tree Risk survey ........................................................................................................................................... 12

Management Survey Results ............................................................................................................................ 12

Mature hybrid Cottonwood Population ........................................................................................................ 13

Young Tree Health ....................................................................................................................................... 15

Tree Pruning ................................................................................................................................................. 17

Plant Health Care ......................................................................................................................................... 20

Planting Program ......................................................................................................................................... 22

Tree Risk Survey Results .................................................................................................................................. 23

Recommendations ....................................................................................................................................... 24

Summary of Management Recommendations & Closing ..................................................................................... 25

Mature Hybrid Cottonwood Mitigation Plan & Tree Risk Management ............................................................ 25

Young Tree Health ........................................................................................................................................... 26

Tree Pruning .................................................................................................................................................... 26

Plant Health Care ............................................................................................................................................. 27

Tree Planting Program ..................................................................................................................................... 28

Attachment 1 – Management unit map ................................................................................................................ 29

Attachment 2 – Blue Lake Tree Species List ......................................................................................................... 30

Attachement 3 – Risk Tree Survey Data & Maps ................................................................................................... 31

Attachment 4 – Aspen Tree Service Recommended Tree List .............................................................................. 32

INTRODUCTION & PURPOSE

The Blue Lake Home Owners Association (HOA) is responsible for management of the landscape on the

properties located within the HOA.

The trees are a significant asset to the Blue Lake community. Protecting this asset and realizing the

benefits of a healthy landscape are goals of the HOA. To that end, the HOA hired Aspen Tree Service to

complete an assessment of the trees and develop an arboricultural management plan to help guide the

HOA in the management of this valuable asset.

ABRORICULTURAL NEEDS & TREATMENTS

What are the critical factors influencing tree health in the landscape? The first and most important is

water. Too much or too little water will lead to plant stress. Second is the soil. Soil is where plants get

the water and nutrients they need to sustain life. Third are insect pests and disease. Finally, there is

physical damage. Damage can be caused by animals and storms but more commonly by humans.

It is true that any one of these factors can led to poor plant health, in the most severe cases, death.

However, in the majority of cases, the causes are a combination of these factors and like humans, if you

are generally healthy, you can survive a health stressing event. Therefore, the most effective strategy

to protect our trees and realize all the benefits they provide is monitor plant health needs and employ

treatments that will enhance tree health and minimize tree stress and damage.

WATER

There are three important factors in influencing the water needs of the landscape. The most obvious is

the quantity and frequency the landscape receives water, either by Mother Nature or irrigation. Second,

poor water quality can impact tree health. Finally, is the soil. Plants get the water they need from the

soil and the physical texture and chemistry of the soil will dictate the moisture that is available to a

plant. Discussion regarding this factor will be reserved for the soils section.

Too much or too little water will return the same result; plant stress, decline and possibly death. How

much water does a plant need? Monitoring the soil moisture is a simple task to measure water needs

and then a watering prescription can be applied.

WATERING PRESCRIPTION

Trees should receive 10 gallons of water per inch of diameter per week during the growing

season.

Winter watering is recommended when the irrigation system is off, soil temperatures are above

freezing, and the soil is dry and un‐snow covered.

Irrigation Systems – Irrigation systems are convenient, however without knowledge of the

frequency and volume of water they are applying water problems can arise.

o Inspect and test the irrigation system at least once a year.

o Irrigation Program

It is best to program the irrigation system on a frequency of 2 to 3 times a week

for durations of 20 to 30 minutes versus higher frequencies and shorter

durations. This will promote deeper plant rooting and drought tolerance.

Keeping the watering prescription in mind, monitoring the soil moisture is the most effective way to

access the need for water. Tree roots need oxygen. Ideally, the soil around a plant should be moist but

never wet and in fact dry periods are beneficial. Our native clay textured soils also present challenges in

moisture management. Clay soils are poorly drained, holding moisture which can keep it from a plant

or even drown the plant.

Monitoring soil moisture is even more important on newly planted plants. Plants obtain the majority of

their water needs from the soil through their roots. Transplants have lost as much as 75% of their root

zones in the digging process. Therefore, they will need to receive supplemental watering until they

have “established”; replaced lost roots and root have grown into the undisturbed native soils.

MANAGING SOIL MOISTURE

The treatments for managing soil moisture on a plant are as follows.

Mulching – a layer of mulch around the base of trees and covering a plant bed helps maintain

soil moisture by reducing evaporation.

o Maintain a 3‐inch layer of mulch around the base of the tree but not touching the tree

trunk or plant stems

Monitor Soil Moisture

o Inspect the Plant Foliage

Drooping foliage and death of interior foliage are initial signs of a possible

moisture problem; it can mean there may be too much or too little water. If you

see these symptoms complete a soil moisture sampling.

o Soil Moisture Sampling.

Take 6‐8” deep soil core samples around the root ball.

Ball the soil in your hand;

o Soil Crumbles/dry – water the plant

o Soil Balls – good, allow to dry out before watering

o Soil Wet – bad, allow to completely dry before watering

Chronic Soil Moisture Problems Trees on well drained site

o Poorly Drained Sites.

Remove any berming, mulch or debris under the plant.

Auger drainage sumps around the tree

Install drainage tile system

WATER QUALITY

Most water quality issues come from untreated water sources such as wells or irrigation ditches.

Common water quality issues that affect plant health are high pH, and the high presence of minerals

such as calcium and salts.

SOILS

The soil provides, or adversely does not provide, nutrients and water for plant growth. Ideally, soils

should be well drained, rich in organic matter and have a pH less than 7.0. The two factors that dictate

the health of the soil for plant growth are texture and chemistry.

Roaring Fork Valley soils are typically clay in texture. Clay is a very small particle. As a result, the space

between soil particles is very small and this restricts the movement of water and nutrients through the

soil. They also typically have a high pH, above 7.0. High pH soils chemically “tie up” plant nutrients and

water. These factors make water and nutrients less available for plant uptake. These soils do not drain

well and can also be high in salts which will actually draw moisture out of plants.

That said, all plants benefit from periodic nitrogen/phosphorus/potassium and organic matter

fertilization. In the natural setting, these “macro” nutrients, as well as organic matter and associated

beneficial microorganisms, are supplied by the decaying vegetative matter (leaves & wood debris) which

is regularly removed from the landscape in urban areas.

Treating poor soil conditions is a long‐term process of treatment and testing. If soil issues are

suspected,.the soil should be tested to be sure the soil drains and then tested to determine the soil

texture and chemistry. If any deficiencies are found a treatment program can be developed to address

these deficiencies; improve drainage and build the topsoil. The following is a list of common deficiencies

and treatments.

POOR DRAINAGE

Install root wells, drainage sumps or tile system.

BUILD THE TOP SOIL

Aeration

o Aeration ‐ soil improves gas exchange, water penetration and introduces organic matter

building topsoil.

Add Organic Matter

o Adding organic matter with a compost product will introduce organic matter, nutrients

and beneficial microorganisms building the topsoil.

Improve Soil Chemistry

o Based on the soil test results use soil injection technics to add treatments to adjust the

pH, leach salts, and add nutrients, organic matter and microorganisms.

INSECT PESTS & DISEASE

Maintaining plant health is the best strategy to minimizing the impact of insect pests and disease.

Depending on an owner’s tolerance for these problems, insect pests and diseases can be treated

passively or aggressively, using organic or chemical treatments. The most passive approach is to let

nature take its course and apply no treatments. A better approach is to ensure plants have the water

and nutrients they need to remain healthy and treat pests and disease as they become a problem.

There are pests and diseases common in the Roaring Fork Valley and the following are the pests,

diseases and hosts.

Table 1. Common Insect Pests & Diseases in the Roaring Fork Valley Leaf Feeding Insects Aphids Sucking insect, leaf curling and

death Aspen, Birch, Elm, Dogwood, Juniper, Pine, Rose, Spirea, Spruce

Elm Leaf Beetle Larvae feed on leaves Elm

Leaf Miner Mines the interior of leaves Aspen, Birch, Elm, Lilac, Oak, Pine,

Mites Galls, curling and damage to leaves or flowers

Aspen, Cottonwood, Elm, Honeylocust, Juniper, Maple, Oak, Pine, Polar, Spruce, Willow

Scale Sucking insect, leaf curling and death

Juniper, Pine, Spruce

Stem Feeding Insects

Borers Bore live wood tissue leading to stem and plant death

Aspen, Birch, Cottonwood, Dogwood, Douglas‐fir, Elm, Juniper, Pine, Spruce, Rose

Galls

Scale sucking insect, shoot & stm death

Ash, Dogwood, Elm, Euonymus, Pine. Rose

Tip Moths Larve feed on new shoots killing the shoot

Pine,

White Pine Weevil Larve feed on new shoots killing the shoot

Blue Spruce, White Pine

Diseases

Cankers Fungal or bacteria causing stem wounds

Aspen, Cherry, Dogwood, Cottonwood, Elm, Honeylocust

Fireblight Bateria, "burned" look of leaves and stem.

Apple, Crabapple, Mountain‐Ash, Cherry

Rusts Powdery rust on leaves Hawthorn, Juniper, Serviceberry

Leaf Spot Fungal, black spotting Dogwood, Maple, Rose

Nutrient Deficiencies Chlorosis ‐Yellowing of leaves Hackberry, Maples, Oaks

TREATMENTS

Treating pest problems can be accomplished two ways; culturally or using pesticides.

CULTURAL

Cultural practices are really “mechanical treatments”. They are also categorized as organic treatments.

Monitor plants for signs of insect and disease.

If insect pests are observed simply physically remove them or hose them off with water.

Pruning

o Prune infested or infected branches.

o Make sure proper pruning cuts are used to help ensure speedy wound closure

PESTICIDE TREATMENTS

ORGANIC

Cultural practices are organic treatments. An organic treatment should also include managing plant

fertility. The following examples are organic “chemicals” that will provide some control of insect pests.

Insecticidal Soaps & Arboriculural Oils – both of these treatments essentially suffocate the

insect. The application must be timed to coincide with the time the insect is most susceptible.

CHEMICAL PESTICIDES

The have been significant advancements in the science of chemical products and application methods

to enhance the safety of pesticide use.

Regulation & Information – Commercial pesticide applicators must be certified by the State of

Colorado. They are required to take an proficiency exam and complete ongoing education to

maintain the certification.

Pesticide Mode of Action – All pesticides are very specifically designed to control a particular

insect, to be applied when the insect is most susceptible and when the impact on beneficial

insects is minimized.

Application Methods – In the “old days” all pesticides were applied by spraying it on the plant.

Today, application methods are used that reduce the amount of pesticide applied and the

exposure of the pesticide “outside’ of the plant. The following are the application methods and

descriptions used today

o Drenching – the pesticide is poured around the base of the plant and is quickly

absorbed by the plant’s root mass around the base of the plant.

o Soil Injection – the pesticide is injected into the soil and absorbed by the plant’s roots.

o Trunk Injection – the pesticide is injected into the trunk of the tree.

o Spraying – reserved for pests or diseases that this is the only effective control method.

PLANT HEALTH CARE PROGRAM

Plant Health Care is the industry term that encompasses plant fertility, soil enhancement, and insect &

disease treatment services. A Plant Health Care Program is a program to monitor and treat plant

fertility, soil enhancement and insect & disease problems. A qualified technician visits the site based on

an annual plant health care schedule corresponding to pest and fertility treatment schedules. The

technician applies specified fertility treatments and pesticide treatments only if necessary.

PHYSICAL DAMAGE

Physical damage creates wounds that allow for the introduction of disease and almost all physical

damage is avoidable. The most common human caused damage is caused by lawn mowers and string

trimmers striking the plant. Low hanging branches or branches striking permeant structures can also

lead to damage. Mother nature, storm events, is probably the most common cause of damage.

Structurally defective branches and stems can be ripped from a tree.

TREATMENTS

Create mulch rings around trees in lawn areas to avoid lawn mower and string trimmer damage.

Pruning

o Properly prune low hanging or branches conflicting with structure to ensure they are

not damaged.

o Proper and regular structural pruning, primarily on trees but also shrubs, will

significantly reduce the majority of storm related damage.

OTHER PLANT HEALTH TREATMENTS

PRUNING

Trees shed branches as a natural process. Branches that are inefficient at capturing energy die and are

shed. Weakly attached or defect branches can be “ripped” from a tree during normal weather events.

Regular pruning mimics the natural shedding process by removing dead, dying and defective branches

in a controlled way and will prolong the lifespan of a tree. Pruning dead branches reduces the

probability of the introduction of disease. Removing defective branches will ensure the catastrophic

damage that can occur when a branch is “ripped” is avoided. In the “residential” setting, pruning is also

completed for safety reasons. We don’t want these branches to fail and cause personal injury or

property damage.

A regular pruning schedule is determined by the age of the trees. Young trees are growing vigorously,

requiring more frequent and “aggressive” pruning. Young tree pruning focuses on promoting sound

branching structure to ensure defective branching structure is not present at maturity. Growth of

mature trees slows, the amount of pruning that can be completed is limited and pruning focuses on

removing deadwood and severely defective branches. Conifers will require limited pruning, primarily

when they are young to eliminate any structural issues that may develop. Deciduous trees will need to

pruned regularly throughout their life.

STAKING

Large transplanted trees will require staking until they become established. The guying should allow

the tree trunk to sway as much as 3 inches. This helps develop root anchoring and trunk strength.

Staking should be removed after 3 years.

TREE REMOVAL

At a certain point, the cost to maintain a declining plant or aesthetics make removal and replacement

of the plant a better short and long‐term treatment.

PROFESSIONAL TREE & LANSCAPE SERVICES

The generic term, “green industry” is used to identify companies that provide all landscape care service

from lawn mowing, landscape design to tree care. This broad range of services and the variability of

expertise available can be confusing for the consumer. An educated consumer is the best consumer. To

that end, the following are the professional organizations that have certification programs for the

company and employees that consumers of “green services” should look to when choosing a service

provider.

International Society of Arboriculture (www.isa‐arbor.com )

National Association of Landscape Professionals (www.landscapeprofessionals.org )

State of Colorado Department of Agriculture (www.colorado.gov/pacific/agplants/commercial‐

pesticide‐applicators )

Tree Care Industry Association (www.tcia.org )

TREE SURVEY METHODOLOGIES, FINDINGS & RECOMMENDATIONS

METHODOLOGIES

The property was divided into 9 management areas (See Attachment 1). Management units divide the

work geographically and larger numbers of needs into smaller more manageable numbers of needs.

This facilitates organizing and completing work more efficiently.

Each of the management area was walked and two types of management surveys were completed; a

management survey and a tree risk survey.

MANAGEMENT SURVEY

The objective of the management survey was to identify short and long‐term arboricultural

management issues. Information collected included the tree species present, the approximate number

of each tree species, the size/age, insect and disease presence, and management needs. This survey

was completed first and based on findings of the survey, the tree risk survey was organized to be

consistent with those findings.

TREE RISK SURVEY

The objective of the tree risk inventory was to identify trees that pose a risk to people or property and

make management recommendations to reduce these risks.

Each risk tree identified was tagged with a numbered aluminum tag and management information

collected for the tree. Management information collected for each tree inventoried included the

management area, tag#, tree species, # of stems, diameter, health and structure, management need

and GPS coordinates. The location of each tree was mapped by Tag#.

MANAGEMENT SURVEY RESULTS

The survey revealed there

are approximately 880 trees

including 33 different

species of trees (See

Attachment 2).

Cottonwood, numbering

369 trees is by far the most

populous followed by

spruce and crabapple (Chart

1).

369

129

127

59

55

52

5141

Chart 1. Tree Genus Distribution

COTTONWOOD

SPRUCE

CRABAPPLE X FLOWERING

OTHERS

WILLOW

AUTUMN OLLIVE

PINE

ASH

The management issues/challenges revealed by the survey are as follows.

The large population and condition of the mature hybrid cottonwoods

The poor health of young trees.

Tree pruning needs

Plant Health Care needs

Tree Planting Program

MATURE HYBRID COTTONWOOD POPULATION

The HOA faces a significant challenge in managing the cottonwoods. 338 of the cottonwood are

believed to be a hybrid and 31 are the native narrowleaf cottonwood. The hybrid cottonwood is a large

tree species, exceptionally fast growing, relatively short lived and when they reach the end of their

lifespan they decline quickly. The life expectancy of these hybrids in Colorado is and estimated 40 and

50 years. Ninety‐five percent of these suspected hybrid cottonwood are mature, an estimated 30‐40

years old and symptoms of decline are beginning to appear.

Photo 1. The 3 trees on the right are exhibiting varying symptoms of decline. Note the crowns of the trees

versus the trees on the left.

Contributing to the decline of these trees are insect pests and disease that can attack a healthy tree but

most often attack trees that are under stress. These insects and diseases are common on trees that are

showing symptoms of decline.

In addition, these trees have not received regular structural

pruning. As a result, the majority of these trees have poor

branching structure. These branches are prone to failure in

normal storm events. Structural pruning can be performed

to reduce the risks of these branches failing, however the

size and rate of recurrence of these defective branches

within these trees would require extensive and aggressive

pruning. This is compounded by high frequency of these

problems in the majority of the cottonwood population,

the health of these trees and their long‐term sustainability.

Photo 2. The brown spots on this limb are exit

holes of the poplar borer. This tree (Tag# 65)

is in Mgmt Unit 1 adjacent to the pond.

Photo 3. This wound was cause by cytospora

and it has compromised the structure of this

stem should be removed.

Photo 4. This double stem union in Mgmt

Unit 2 is structurally weak and prone to

failure.

RECOMMENDATIONS

The combination of these problems presents significant challenges for the HOA. Those challenges

include managing the risk these trees present to people and property, the removal of declining trees

and the aesthetic impact, the replacement of the trees and the cost to mitigate these issues. The

following is the recommended management strategy.

Annual Tree Risk Survey ‐ Hire a consulting arborist to complete an annual risk tree inventory of

the entire HOA property to identify the following.

o Priority Pruning Needs ‐ Relatively healthy trees with structural defective branches

present that have a high failure risk.

o Removal – Trees in poor health and declining trees.

o Prioritize the needs – focus resources on high use areas first, such as along roadways,

and then lower use areas.

The survey will provide all tree risk management needs in addition to the current status of

individual hybrid cottonwoods. The status of the cottonwoods will provide an estimate of the

rate of decline of these trees to anticipate future needs in addition to the management needs of

the trees that year. This first of these surveys was completed and the results are detailed in the

Tree Risk Survey Results section.

Develop an Hybrid Cottonwood Mitigation Plan & Budget based the findings of the Annual Risk

Survey.

o Number of removals per year

o Years until all hybrid cottonwoods are removed.

Allocate sufficient financial resources to fund the annual risk survey, safety pruning, tree

removal and replacement. Utilize the findings of this year’s Tree Risk Survey as a “tool” in

developing an annual budget.

YOUNG TREE HEALTH

The majority of “recently” planted trees are in poor health. These

plantings represent a significant financial and aesthetic

investment for the HOA and the community.

Photo 5. These recently planted

cottonwoods on the western border of

Mgmt Unit 2 are unfortunately common

examples of poorly performing recent

plantings. Lack of regular watering is the

most likely cause.

Photo 6. This oak tree located in Mgmt

Unit 2 is performing poorly. Regular

watering as well as a young tree fertility

treatment would enhance tree health and

long‐term viability.

Photo 7. The base of this maple tree has

been damaged by mowing equipment.

The turf around trees should be removed

and replaced by mulch to protect trees

from this type of damage and help

maintain soil moisture for the tree.

RECOMMENDATIONS

Fortunately, simple and relatively low costs treatments and management strategies can be employed

to realize improvements. These can be divided into tasks/treatments that HOA staff can complete and

those more suitable for an arboricultural service provider to perform.

HOA Tasks

Install mulch rings around the bases trees – Mulch rings around the bases of young trees, and

older trees, will help retain soil moisture and help protect the trees from accidental damage.

o Remove the turf around the tree to the dripline, install and maintain 3 inches of mulch.

Watering ‐ Trees require 10 gallons of water per inch of tree diameter each week throughout

the growing season and when soil temperatures are above freezing in the winter.

o Purchase and install tree watering Gator Bags (http://www.treegator.com/ ) on new

plantings. Use for at least 3 years after planting.

Planting – At a minimum the root crown of a new planting should be planted at grade. Ideally,

given the soil conditions in the Valley, a tree should be planted with the root crown above

grade.

o Excavate the top of the root ball to locate the root crown

o Plant trees with root crown between 3 & 6 inches above grade.

Pruning – Provide structural pruning every 3 years until pruning cannot be completed from the

ground with hand tools.

Arboricultural Service Provider

Fertility

o Apply a young tree establishment package that includes soil wetting agents, soil

microbes and the appropriate fertilizers (low/slow release nitrogen & high phosphorus).

Watering

o Professional deep watering services are available to augment in‐house watering as

needed and include added benefits such as soil wetting agents to improve plant uptake.

TREE PRUNING

As was discussed in the Arboricultural Needs & Treatments section and noted as an issue with the

cottonwood and young trees, tree pruning is a management task that should be completed on a regular

basis. Observations made during the survey revealed this task is has not been completed on a regular

basis. The result is poor branching structure that is prone to failure.

Photo 10. Small trees such as this

crabapple located in Mgmt Unit 3 benefit

from regular pruning too. In addition the

structural issues, regular pruning includes

pruning dead, diseased and for under

canopy clearance.

Photo 8. This narrowleaf cottonwood

tree located in Mgmt Unit 4 has very poor

branching structure that could have been

corrected by regular pruning. Tight, V‐

shaped branch unions are structurally

weak and prone to failure. The willow

trees, most are located in Mgmt Unit 5,

have similar structural problems.

Photo 9. A single central stem, like on

this cottonwood in Mgmt Unit 3, is a

desirable structural feature.

RECOMMENDATIONS

Pruning needs are grouped into age/size classes specifying the frequency pruning should be completed

and the skill level required to complete the pruning.

Young Trees – prune every 3 years until their annual growth falls to or below 6 inches a year or

cannot be pruned from the ground with hand tools.

o With proper training this task can be performed by HOA staff or volunteers with proper

training.

Small Trees – A small tree is defined as a tree that can be pruned from the ground with hand

tools throughout its lifespan.

o Small trees should every 5 to 7 years.

Large Trees – A large tree is defined as a tree that cannot be pruned from the ground with hand

tools.

o Trees located along HOA streets should be pruned every 5 years.

o Trees located on the open space properties should be pruned every 7 years.

Meeting these needs can be completed by organizing the trees and needs into two pruning programs

and allocating sufficient resources to complete the work annually.

Priority Pruning Program

Pruning to reduce the risk of branch failures. Trees to be pruned would be identified in an annual tree

risk survey discussed in the Tree Risk Survey Results section.

Rotational Pruning Program

Perform maintenance pruning on a set number trees based on the pruning frequency of the population

of young, small and large trees in a localized area (Mgmt Unit) each year. This program spreads the

workload and cost over the number of years of the pruning frequency.

Young Trees – Approximate Population 100 trees, 3‐year rotation, prune 33 trees per year

Small Trees ‐ Approximate Population 116 trees, 5‐year rotation, prune 24 trees per year

Large Trees (Excluding Hybrid Cottonwoods) ‐ Approximate Population 300 trees, 5‐year

rotation, prune 60 trees per year

PLANT HEALTH CARE

Plant Health Care is the industry term used to group plant health needs including moisture

management, fertility and insect & disease treatment. The survey revealed watering, fertility and insect

& disease issues.

MOISTURE MANAGEMENT (WATERING)

Watering deficiencies on recently planted trees were observed, discussed and recommendations made

above in the Young Tree Health section. There were no significant moisture management issues

observed on the mature trees. However, maintaining providing sufficient and consistent water for the

mature trees is a critical plant health objective. Different species of trees have different moisture

requirements to maintain health. Lodgepole and Ponderosa pine prefer dry conditions. The rest of the

tree species present (95%) require regular watering to maintain tree health. Changes in a watering

source and frequency will also stress a tree. Changes such as significant alterations of the irrigation

cycles will impact trees in those areas or suspending the flow of water in irrigation ditches will impact

the cottonwood that line the ditches.

Portions of the community properties are irrigated and some are not irrigated. Given the majority of

the trees have higher water requirements irrigated areas should receive long duration, less frequent

irrigation cycles to maintain tree health recognizing that dryland trees species present in these areas

may suffer. Trees located on non‐irrigated areas will require supplemental watering to maintain tree

health. Any tree plantings on non‐irrigated areas should be tree species with low water requirements.

SOILS & FERTILITY

Ideally, we would like to see at least 12 inches of topsoil,

however this is rare in Roaring Fork Valley landscapes.

Random soil probing revealed there is between 3 and 10

inches of topsoil. In areas such as Mgmt Unit 1, where the

topsoil depth is low, reduced tree health and symptoms of

nutrient deficiencies were more common.

Photo 11. Off‐color leaves, such as on this

maple located on Mgmt Unit 1 is a

symptom of nutrient deficiencies.

INSECT PESTS & DISEASE

Insect pests and disease problems were observed. Poplar borer and cytospora canker were observed on

the cottonwood trees throughout the property and two aspen tree recommended for removal in Mgmt

Unit 6. Limited infestations of cooley spruce gall (brown galls on twig ends, largely aesthetic problem)

were observed on the Colorado spruce Other significant issues observed are as follows.

Crabapple trees are susceptible to a large number of insect pests and disease. The best crabapple

management practice is to remove very susceptible selections and plant tolerant selections. There are

treatments for select problems that can be applied if preservation of a select tree or group of trees is

preferred.

There are 41 green ash trees representing 4.7% of the population. This is not an excessive percentage of

the population, however ash does have some chronic pest problems, one of which is fatal. Two

common pests, scale and lilac/ash borer, were observed

active on the trees and are treatable Emerald Ash Borer

(http://www.emeraldashborer.info/) is a fatal insect

pest that is present on the front range, yet to be found

on the western slope however it is only a matter of

time. There is a preventative trunk injection treatment

but it must be reapplied ever 2 to 3 years. Because of

these problems, we do not recommend planting ash

trees.

Photo 12. Crabapple suffering from

fungal apple scab disease. Some

selections of crabapple are very

susceptible to this disease.

Photo 13. Green ash tree infested with lilac/ash

borer. Preventative treatments should be applied

on health trees. Damaged and infested branches

should be pruned and a preventative treatment

applied to if preservation is desired on infested

the trees.

RECOMMENDATIONS

Water/Moisture Management

o Provide regular supplemental watering for tree plantings and trees in non‐irrigated

areas

o Irrigated Areas – irrigate on long‐duration irrigation every 3 days during the growing

season

Soils/Fertility

o General

Aerate root zone & apply organic matter such as Nutri Mulch or Pro Peat

o Tree Specific Deficiencies

Preform soil testing if necessary and treat deficiencies

Insect Pests & Disease

o Provide regular preventative treatments on ‘high value’ trees

o Monitor for insect pests and disease and treat as necessary

Plant Health Care Program

The simplest approach to managing fertility and insect pest and disease problems is to secure a

Plant Health Care Program contract with a qualified service provider. The services to be

provided could be customized to meet the HOA’s needs based on the desired levels of

management and budget.

PLANTING PROGRAM

A simple planting program would set goals to regularly plant trees to maintain or increase the tree

population, and meet landscape design and management objectives.

RECOMMENDATIONS

A tree planting program is recommended. The program should have the following objectives.

Maintain or Increase the tree population

o Annual Tree Planting Number – number of trees removed in the year plus 10% to

maintain the present population number.

o Allocate an annual budget figure to meet this tree planting goal.

Tree Species Selection

There is a large selection of tree species that can be planted in the Valley (Attachment 4). Some

are more tolerant of the environmental conditions of the Valley versus others and some are

more disease and insect pest resistant versus others. The less tolerant tree species are more

costly to maintain. Given the large number of trees the HOA manages, avoiding planting these

less tolerant trees species will simplify management and will be less costly.

o Select dryland tree species for non‐irrigated areas.

o Select tree species that tolerate the high pH, clay soil conditions.

o Select insect pest and disease resistant tree species

o Integrate Tree Species Diversity – avoid planting tree species that have a high

representation in the population to avoid the potential impact of insect pests, disease

or other tree species specific management problems that may arise.

Tree genus does not exceed 10% of the population

Tree species does not exceed 5% of the population

TREE RISK SURVEY RESULTS

The tree risk survey identified 43 trees requiring priority management (Table 2 & Attachment 3). These

work needs represents 4.9% of the population of trees which is not an excessive finding. One of three

management recommendations were made for each tree. Thirty‐seven of these trees are hybrid

cottonwoods.

Prune Safety – Perform a safety prune on a

tree in fair health or better

Prue Safety/Remove – Perform a safety prune

or if the tree is a hybrid cottonwood consider

removal.

Prune Reduce – Perform reduction pruning to

reduce the risk of tree or scaffold branch

failure on a tree in fair health or better

Remove – Remove tree, poor health and

structure

Table 2. Risk Tree Mgmt Needs

Mgmt Need # of

Trees

Prune Safety 12 Prune Reduce 5 Prune Safety/ Remove

13 Remove 13 Total 43

RECOMMENDATIONS

These findings can be used to estimate the number of annual removals and priority pruning needs

property wide as well as the hybrid cottonwood needs and the annual cost to meet these needs.

Fund and Complete an Annual Tree Risk Survey

The work identified in this survey should be completed within a year.

Develop a budget to meet the findings of the risk survey

Hybrid Cottonwood Management Plan

The number of hybrid cottonwoods and their management recommendations found in the risk survey

can be used to develop a hybrid cottonwood management strategy and budget.

Secure unit price cost estimates to complete all the work and two costs for the following Mgmt

Need Designations

o Pruning trees designated Prune Safety/Remove

o Remove Pruning trees designated Prune Safety/Remove

Develop an annual removal plan. The risk survey results will indicate if trees are declining slowly

or quickly and will assist in setting the number of removals per year and years to completion.

o For Example

Photo 14. Typical tree recommended for

removal. Severely declining aspen infested with

poplar borer and cytospora infected.

9 trees are recommended for removal in this survey and 13 are

declining/possible removal candidates

Assign a 20‐year plan to remove all hybrid cottonwood

Remove 18 trees per year

Develop an Annual Hybrid Cottonwood Removal Budget

SUMMARY OF MANAGEMENT RECOMMENDATIONS & CLOSING

Managing a large population of trees, like any asset, presents challenges and competes for the limited resources the HOA has to manage all of the community assets. The purpose of this arboricultural assessment and report was to find deficiencies and make recommendations to correct those deficiencies. This report provides a lot of information and the challenges presented in this report should not be seen as an indication of substandard management. The HOA staff recognized they are not arboricultural professionals and secured qualified expertise to assist the HOA in managing this valuable asset. The objective of this report is to provide the HOA with a reference document that has the information necessary for the HOA to make informed decisions. The following summarizes the recommendations.

MATURE HYBRID COTTONWOOD MITIGATION PLAN & TREE RISK MANAGEMENT

Managing the Blue Lake community tree population includes identifying trees that may pose an

unacceptable risk to people and property and mitigating those risks. Completing an annual tree risk

survey and completing the work found in that survey will fulfill this obligation. It will also provide the

HOA with the information necessary to plan and budget to meet tree risk and the hybrid cottonwood

management needs.

We anticipate the hybrid cottonwood tree population is going to decline at an accelerating rate. This

will result in higher pruning and removal costs. Time will tell how quickly these trees decline and the

actual impact. Developing a management strategy will help mitigate the impact and cost of meeting

this challenge.

Fund and Complete an Annual Tree Risk Survey

Complete the work identified in the Annual Tree Risk Survey within a year.

Develop an annual budget to meet the findings of the Annual Tree Risk Survey

Develop an Hybrid Cottonwood Mitigation Plan & Budget based the findings of the Annual Risk

Survey.

YOUNG TREE HEALTH

HOA Tasks

Install mulch rings around the bases trees – Mulch rings around the bases of young trees, and

older trees, will help retain soil moisture and help protect the trees from accidental damage.

o Remove the turf around the tree to the dripline, install and maintain 3 inches of mulch.

Watering ‐ Trees require 10 gallons of water per inch of tree diameter each week throughout

the growing season and when soil temperatures are above freezing in the winter.

o Purchase and install tree watering Gator Bags (http://www.treegator.com/ ) on new

plantings. Use for at least 3 years after planting.

Planting – At a minimum the root crown of a new planting should be planted at grade. Ideally,

given the soil conditions in the Valley, a tree should be planted with the root crown above

grade.

o Excavate the top of the root ball to locate the root crown

o Plant trees with root crown between 3 & 6 inches above grade.

Pruning – Provide structural pruning every 3 years until pruning cannot be completed from the

ground with hand tools.

Arboricultural Service Provider

Fertility

o Apply a young tree establishment package that includes soil wetting agents, soil

microbes and the appropriate fertilizers (low/slow release nitrogen & high phosphorus).

Watering

o Professional deep watering services are available to augment in‐house watering as

needed and include added benefits such as soil wetting agents to improve plant uptake.

TREE PRUNING

Pruning needs are grouped into age/size classes specifying the frequency pruning should be completed

and the skill level required to complete the pruning.

Young Trees – prune every 3 years until their annual growth falls to or below 6 inches a year or

cannot be pruned from the ground with hand tools.

o With proper training, this task can be performed by HOA staff or volunteers with

proper training.

Small Trees – A small tree is defined as a tree that can be pruned from the ground with hand

tools throughout its lifespan.

o Small trees should every 5 to 7 years.

Large Trees – A large tree is defined as a tree that cannot be pruned from the ground with hand

tools.

o Trees located along HOA streets should be pruned every 5 years.

o Trees located on the open space properties should be pruned every 7 years.

Meeting these needs can be completed by organizing the trees and needs into two pruning programs

and allocating sufficient resources to complete the work annually.

Priority Pruning Program

Pruning to reduce the risk of branch failures. Trees to be pruned would be identified in an annual tree

risk survey discussed in the Tree Risk Survey Results section.

Rotational Pruning Program

Perform maintenance pruning on a set number trees based on the pruning frequency of the population

of young, small and large trees in a localized area (Mgmt Unit) each year. This program spreads the

workload and cost over the number of years of the pruning frequency.

Young Trees – Approximate Population 100 trees, 3‐year rotation, prune 33 trees per year

Small Trees ‐ Approximate Population 116 trees, 5‐year rotation, prune 24 trees per year

Large Trees (Excluding Hybrid Cottonwoods) ‐ Approximate Population 300 trees, 5‐year

rotation, prune 60 trees per year

PLANT HEALTH CARE

Water/Moisture Management

o Provide regular supplemental watering for tree plantings and trees in non‐irrigated

areas

o Irrigated Areas – irrigate on long‐duration irrigation every 3 days during the growing

season

Soils/Fertility

o General

Aerate root zone & apply organic matter such as Nutri Mulch or Pro Peat

o Tree Specific Deficiencies

Preform soil testing if necessary and treat deficiencies

Insect Pests & Disease

o Provide regular preventative treatments on ‘high value’ trees

o Monitor for insect pests and disease and treat as necessary

Plant Health Care Program

The simplest approach to managing fertility and insect pest and disease problems is to secure a

Plant Health Care Program contract with a qualified service provider. The services to be

provided could be customized to meet the HOA’s needs based on the desired levels of

management and budget.

TREE PLANTING PROGRAM

Maintain or Increase the tree population

o Annual Tree Planting Number – number of trees removed in the year plus 10% to

maintain the present population number.

o Allocate an annual budget figure to meet this tree planting goal.

Tree Species Selection

There is a large selection of tree species that can be planted in the Valley (Attachment 4). Some

are more tolerant of the environmental conditions of the Valley versus others and some are

more disease and insect pest resistant versus others. The less tolerant tree species are more

costly to maintain. Given the large number of trees the HOA manages, avoiding planting these

less tolerant trees species will simplify management and will be less costly.

o Select dryland tree species for non‐irrigated areas.

o Select tree species that tolerate the high pH, clay soil conditions.

o Select insect pest and disease resistant tree species

o Integrate Tree Species Diversity – avoid planting tree species that have a high

representation in the population to avoid the potential impact of insect pests, disease

or other tree species specific management problems that may arise.

Tree genus does not exceed 10% of the population

Tree species does not exceed 5% of the population

ATTACHMENT 1 – MANAGEMENT UNIT MAP

Attachment 1 - Tree Management Units

7

8

9

1

2

3

4

5

6

ATTACHMENT 2 – BLUE LAKE TREE SPECIES LIST

Blue LakeTree Species List

Aspen Tree ServiceSeptember 2017

Species# of

Trees

% of

PopAPPLE COMMON 4 0.46%

ASH GREEN 41 4.68%

ASPEN QUAKING 25 2.85%

AUTUMN OLLIVE 52 5.94%

BIRCH EUROPEAN 1 0.11%

BUCKEYE OHIO 4 0.46%

CHERRY SPECIES 1 0.11%

CHOKECHERRY ‐ CANADA RED 1 0.11%

COTTONWOOD, NARROWLEAF 31 3.54%

COTTONWOOD, HYBRID 338 38.58%

CRABAPPLE X FLOWERING 127 14.50%

ELM SIBERIAN 3 0.34%

HONEYLOCUST 16 1.83%

HORNBEAM EUROPEAN 2 0.23%

JUNIPER ROCKY MOUNTAIN 5 0.57%

LINDEN LITTLELEAF 4 0.46%

MAPLE AMUR 4 0.46%

MAPLE NORWAY 8 0.91%

MAPLE ROCKY MOUNTAIN 2 0.23%

MAPLE SILVER 2 0.23%

MAPLE X FREEMAN 1 0.11%

MOUNTAIN‐ASH 2 0.23%

OAK BUR MOSSY CUP 4 0.46%

PEAR CALLERY 2 0.23%

PINE AUSTRIAN 4 0.46%

PINE LODGEPOLE 24 2.74%

PINE PONDEROSA 15 1.71%

PINE SCOTCH 8 0.91%

PLUM PURPLELEAF 8 0.91%

POPLAR WHITE UPRIGHT 3 0.34%

SERVICEBERRY 2 0.23%

SPRUCE COLORADO BLUE 129 14.73%

WILLOW BABYLON WEEPING 55 6.28%

Total 883

ATTACHEMENT 3 – RISK TREE SURVEY DATA & MAPS

Blue Lake HOATree Risk Survey Trees

Aspen Tree Service September 2017

Mgmt Unit

SiteTypeTag

#Species

# of Stems

DBH Health Structure Mgmt Need Priority Comments

1 Open Space 61 WILLOW BABYLON WEEPING

1 22 Good Fair Prune Safety Moderate

1 Open Space 62 COTTONWOOD, HYBRID

1 14 Good Poor Remove Low Retain 1 good stem. Remove defective stem and others


7 24 Fair Fair Prune Safety Low DEADWOOD OVER WALK-Total of 7 trees west of Tagged tree


1 28 Poor Fair Prune Safety Moderate POPLAR BORER


2 36 Good Poor Prune Reduce

High


1 26 Fair Poor Prune Reduce

High POSSIBLE UPROOT


1 28 Fair Fair Prune Safety Moderate DEADWOOD

2 Open Space 72 ASH GREEN 1 11 Poor Poor Remove Low3 Roadside 135 COTTONWOOD,

HYBRID1 10 Poor Poor Remove High CYTOSPORA CANKER ON

TRUNK4 Roadside 137 COTTONWOOD,

NARROWLEAF1 20 Very PooPoor Remove Moderate

4 Roadside 99 COTTONWOOD, HYBRID

1 28 Poor Fair Prune Safety/ Remove

High



Moderate



High



High



Moderate

Page 1 of 3



Mgmt Unit

SiteTypeTag

#Species

# of Stems



1 32 Poor Poor Prune Safety/ Remove

High



High



High


1 34 Poor Poor Remove High




1 32 Fair Fair Prune Safety Moderate


1 16 Poor Poor Remove Moderate TRUNK DECAY



Moderate


1 7 Fair Poor Remove Moderate TRUNK DECAY




1 26 Very PooPoor Remove Moderate

6 Open Space 78 ELM SIBERIAN 1 18 Poor Poor Prune Safety Low6 Open Space 79 ASPEN

QUAKING1 16 Very PooPoor Remove Moderate

6 Open Space 80 ASPEN QUAKING

1 12 Very PooPoor Remove Moderate



High

Page 2 of 3



Mgmt Unit

SiteTypeTag

#Species

# of Stems




Moderate





High


1 28 Fair Fair Prune Safety/ Remove

Moderate


1 28 Fair Fair Prune Safety/ Remove

High



High

Page 3 of 3

ATTACHMENT 4 – ASPEN TREE SERVICE RECOMMENDED TREE LIST

Aspen Tree Service

Recommended Tree List

As of:

September 2017

Deciduous

Botanical Name (GenuCommon Name ‐ CultivarsNeeds

Irrig

Soils

Issue

Insect &

Disease Comments

Acer MapleAcer campestre Hedge

Acer x freemanii Freeman ‐ 'Armstrong', Autumn

Blaze®, Autumn Fantasy®,

Celebration®, Sienna Glen®

X X Develops leaf yellowing

(chlorosis) in hich pH soils

Acer ginnala Amur/ Ginnala ‐ 'Flame' X X Develops leaf yellowing


Acer glabrum Rocky Mountain

Acer grandidentatum Big Tooth ‐ Manzano™ X

Acer negundo Boxelder/ Ash‐leaved ‐ 'Sensation' X

Acer platanoides Norway ‐ 'Columnare', 'Crimson

King', 'Crimson Sentry', 'Deborah',

Emerald Lustre®, 'Emerald Queen',

Fairview®, 'Royal Red'

X

Acer tataricum Tatarian ‐Hot Wings®, Pattern

Perfect™

X

Aesculus Buckeye/HorsechestnutAesculus arguta Texas

Aesculus glabra Ohio X

Aesculus hippocastanum Common Horsechestnut X

Aesculus octandra(flava) Yellow X

Aesculus x carnea Red Hybrid ‐ 'Briotti', 'Fort McNair' X

Alnus AlderAlnus glutinosa Common /Black X X leaf miner

Alnus tenuifolia Thinleaf/ Mountain X X leaf miner

Amelanchier ServiceberryAmelanchier alnifolia Saskatoon

Amelanchier canadensis Shadblow

Amelanchier laevis Allegheny ‐'Snowcloud', Spring

Flurry®

X

Amelanchier lamarckii Lamarck X

Amelanchier x

grandiflora

Autumn Brilliance®, 'Princess Diana',

'Robin Hill'

X X Develops leaf yellowing


Betula BirchBetula nigra River ‐ Heritage® X X X Develops leaf yellowing

(chlorosis) in hich pH soils, birch

borer

Betula occidentalis Rocky Mountain/ Water X X birch borer

Carpinus HornbeamCarpinus betulus European ‐ 'Frans Fontaine',

'Fastigiata' ('Pyramidalis')

X

Celtis HackberryCeltis occidentalis Common X

Celtis Laegigata Sugar, Sugarberry X

Cercis RedbudCercis canadensis Eastern ‐ 'Alba', 'Forest Pansy',

Lavender Twist™

X

Crataegus Hawthorn

Page 1 of 6

Aspen Tree Service


As of:

September 2017


Irrig

Soils

Issue

Insect &

Disease Comments

Crataegus crusgalli Cockspur var. inermis X

Crataegus ambigua Russian

Crataegus douglasii River/Douglas X

Crataegus laevigata English ‐ 'Crimson Cloud', 'Pauls

Scarlet'

X X fireblight disease

Crataegus mollis Downy X X rust disease

Crataegus x mordenensis Hybrid ‐ 'Toba' X

Crataegus phaenopyrum Washington X

Crataegus viridis Green ‐ 'Winter King' X

Crataegus x lavallei Lavalle X

Fraxinus Ash X DO NOT PLANT ‐ Emerald Ash

Borer

Ginkgo biloba Ginkgo/ Maidenhair X

Gleditsia HoneylocustGleditsia triacanthos v.

inermis

Thornless Common ‐Halka™,

Imperial®, Shademaster®, Skyline®,

Sunburst®

X

Gymnocladus Kentucky CoffeetreeGymnocladus dioicus Kentucky Coffeetree ‐ 'Espresso' X

Hibiscus syriacus Rose‐of‐Sharon ‐

'Aphrodite','Ardens','Coelistis',

'Lucy','Red Heart','Woodbridge'

X

Maackia amurensis Amur Maackia X

Malus Apple X

Malus 'Gala' Gala X X fire blight disease

Malus 'Granny Smith' Granny Smith X X fire blight disease

Malus 'Haralred' Haralred X X codling moth

Malus 'Honeycrisp' HoneyCrisp X X codling moth

Malus 'Jonathan' Jonathan X X codling moth, fireblight

Malus 'Liberty' Liberty X X codling moth

Malus 'McIntosh' McIntosh X X codling moth, fireblight

Malus 'Red Delicious' Red Delicious X X codling moth

Malus 'Royal Gala' Royal Gala X X codling moth, fireblight

Malus 'Sweet Sixteen' Sweet Sixteen X X codling moth

Malus 'Yellow Delicious' Yellow Golden Delicious X X codling moth

Malus 'Zestar' Zestar X X codling moth

Malus Crabapple X

Malus 'Adams' Adams X

Malus x 'Branzam' Brandywine® X X fire blight disease

Malus x 'Centzam' Centurion® X

Malus x 'Coralcole' Coralburst™ X

Malus 'David' David X X

Malus 'Dolgo' Dolgo X X

Malus x 'Schmidtcutleaf' Golden Raindrops® X X fire blight disease

Malus 'Hopa' Hopa X X fire blight disease

Malus 'Indian Magic' Indian Magic X

Malus 'Indian Summer' Indian Summer X

Malus ioensis Bechtel 'Plena' X X fire blight disease

Malus 'Prairiefire' Prairiefire X fire blight disease

Page 2 of 6

Aspen Tree Service


As of:

September 2017


Irrig

Soils

Issue

Insect &

Disease Comments

Malus ' Prairie Rose' Prairie Rose X

Malus ' Profusion',

'Radiant'

Profusion, Radiant X

Malus 'Red Barron' Red Barron X X fire blight disease

Malus 'Red Jade',

'Royalty'

Red Jade, Royalty X X fire blight disease

Malus 'Robinson', 'Royal

Raindrops'

Robinson, Royal Raindrops X

Malus sargentii Sargent X

Malus sargentii 'Tina' Sargent Tina X

Malus 'Spring Snow' Spring Snow X X fire blight disease

Malus 'Thunderchild' Thunderchild X

Malus 'Velvetcole' Velvet Pillar™ X X

Populus Poplar (cottonwood & aspen) X

Populus angustifolia Narrowleaf Cottonwood X X Prone to failures, many pests &

disease

Populus deltoides Eastern Cottonwood X X Prone to failures, many pests &

disease

Populus sargentii Plains Cottonwood X X Prone to failures, many pests &

disease

Populus sargentii Sargent, Straight Plains 'Jeronimus' X X Prone to failures, many pests &

disease

Populus tremula European, Aspen ‐ 'Erecta' Upright X X Prone to failures, many pests &

disease

Populus tremuloides Quaking Aspen X X Prone to failures, many pests &

disease

Populus x acuminata Lanceleaf Cottonwood X X Prone to failures, many pests &

disease

Populus x acuminata x

sargentii

Highland Cottonwood X X Prone to failures, many pests &

disease

Populus x canescens

'Tower"

Tower Cottonwood X X Prone to failures, many pests &

disease

Prunus Apricot X

Prunus armeniaca Chinese X

Prunus armeniaca Chinese ‐ 'Moongold', 'Moorpark' X

Prunus Plum & Cherry X

Prunus avium 'Bali' Bali Cherry X

Prunus avium 'Bing' Bing Cherry X

Prunus avium 'Stella

Compact'

Stella Compact Cherry X

Prunus cerasifera Plum Newport (Kankakee) X X borer

Prunus cerasifera Plum Newport (Minnesota) X X borer

Prunus cerasus Cherry ‐'Montmorency', 'North Star' X

Prunus 'Frankthrees' Cherry ‐ Mt. Saint Helens® X X

Prunus maackii Amur Chokecherry X X

Prunus 'Mount Royal' Cherry ‐Mount Royal X

Prunus padus European Birdcherry ‐ Summer

Glow®

X

Page 3 of 6

Aspen Tree Service


As of:

September 2017


Irrig

Soils

Issue

Insect &

Disease Comments

Prunus persica 'Elberta',

'Polly'

Peach ‐ Elberta, Polly X

Prunus persica 'Reliance' Peach ‐ Reliance X

Prunus 'Santa Rosa' Plum ‐ Santa Rosa X

Prunus 'Stanley' Plum ‐ Stanley X

Prunus 'Superior' Plum ‐ Superior X

Prunus 'Toka' Plum ‐ Toka X

Prunus virginiana Common Chokecherry ‐ 'Canada

Red', 'Schubert'

X X

Prunus x fontanesiana Plum ‐ Des Fontaines X

Ptelea trifoliata Wafer ash, Hoptree X

Quercus OakQuercus alba White X X Develops leaf yellowing


Quercus bicolor Swamp White X X Develops leaf yellowing


Quercus buckleyi Texas Red

Quercus ellipsoidalis Northern Pin X X Develops leaf yellowing


Quercus gambelii Gambel X

Quercus macrocarpa Bur X

Quercus muehlenbergii Chinkapin X

Quercus robur English ‐ 'Columnaris','Skyrocket',

'Skymaster'

X

Quercus rubra Red X X Develops leaf yellowing


Quercus shumardii Shumard X

Quercus undulata Wavyleaf X

Quercus alba x robur Crimson Spire® X

Quercus robur x bicolor Regal Prince® X

Robinia pseudoacacia Black Locust ‐ 'Purple Robe' X X borer

Salix Willow X

Salix alba Niobe Weeping ‐ 'Tristis' X X ahpids, canker disease

Salix alba 'Vitellina' Russian Golden ‐ 'Vitellina' X X ahpids, canker disease

Salix amygdaloides Peachleaf X X ahpids, canker disease

Salix matsudana Globe ‐ 'Navajo' X X ahpids, canker disease

Salix x 'Prairie Cascade' Prairie Cascade X X ahpids, canker disease

Sophora japonica Japanese Pagodatree X

Sorbus Mountain‐ash X X

Sorbus intermedia Swedish Whitebeam X

Sorbus aucuparia European ‐ Cardinal Royal® B x x m X X fireblight disease

Sorbus x hybrida Oak Leaf X X fireblight disease

Syringa Lilac X

Syringa pekinensis Peking ‐ 'Summer Charm' X

Syringa reticulata Japanese ‐'Ivory Silk' X

Tilia Linden X

Tilia americana American‐ 'Legend', 'American

Sentry'

X X aphids

Tilia cordata Littleleaf ‐ Greenspire® X X aphids

Page 4 of 6

Aspen Tree Service


As of:

September 2017


Irrig

Soils

Issue

Insect &

Disease Comments

Tilia tomentosa Silver ‐ 'Sterling Silver' X X aphids

Tilia cordata x mongolica Harvest Gold' X X aphids

Tilia x flavescens Glenleven' X X aphids

Tilia x euchlora 'Redmond' X X aphids

Ulmus Elm X X

Ulmus americana American ‐ 'Princeton' X X scale, elm leaf beatle

Ulmus wilsoniana Prospector' X scale, elm leaf beatle

Ulmus japonica x U.

wilsoniana

Accolade' 'Triumph' X scale, elm leaf beatle

Ulmus 'Urban' x U.

wilsoniana

Patriot' X scale, elm leaf beatle

ConifersAbies concolor White Fir

Juniperus JuniperJuniperus chinensis Chinese ‐ 'Blue Point', 'Spartan',

‘Spearmint’, 'Hetzi Columnaris'

X

Juniperus monosperma One‐Seed

Juniperus osteosperma Utah

Juniperus scopulorum Rocky Mountain ‐ 'Welchii', 'Gray

Gleam', ' Cologreen', 'Sky Rocket',

'Wichita Blue', 'Moonglow', 'Medora'

Juniperus virginiana Eastern Red Cedar ‐ 'Hillspire',

‘Idyllwild,’ 'Blue Arrow', 'Taylor',

'Manhattan Blue'

X

Larix decidua European Larch X

Picea Spruce X

Picea abies Norway ‐ 'Cupressina' X

Picea glauca Black Hills 'Densata' X

Picea omorika Serbian X

Picea pungens Colorado X X

Picea pungens glauca Colorado Blue ‐ 'Baby Blue Eyes',

'Bakeri', 'Fastigiata', 'Fat Albert',

Hoopsii, 'Colorado Weeping'

,'Sester's Dwarf'

X X Tussock moth,

Pinus PinePinus aristata Bristlecone(foxtail)

Pinus bungeana Lacebark X

Pinus cembra Swiss Stone Pine X

Pinus contorta Lodgepole X bark beatle

Pinus edulis Pinyon bark beatle, tip moth

Pinus flexilis Limber ‐ 'Vanderwolf's Pyramid'

Pinus heldreichii Bosnian var. leucodermis ‐ 'Emerald

Arrow', 'Iseli Fastigiata'

X

Pinus monophylla Singleleaf Pinyon

Pinus mugo Mugo ‐ ' Big Tuna','Tannenbaum' X

Pinus nigra Austrian ‐ 'Arnold's Sentinel' X

Pinus ponderosa Ponderosa bark beatle

Page 5 of 6

Aspen Tree Service


As of:

September 2017


Irrig

Soils

Issue

Insect &

Disease Comments

Pinus strobus Eastern White X X

Pinus strobiformis Southwestern White X

Pinus sylvestris Scotch X bark beatle

Page 6 of 6

Documents

BLUE LAKE HOA ABRORICULTRUAL MANAGEMENT...Ash, Dogwood, Elm, Euonymus, Pine. Rose Tip Moths Larve feed on new shoots killing the shoot Pine, White Pine Weevil Larve feed on new shoots