Plant Disorders

Nursery/Landscape

INSECTS

Aphid

• Aphids are small (about 1/8 of and inch long), soft-bodied, pear-shaped insects of many colors such as green, black, gray, yellow or red.

Aphids on a Corn leave

Bag Worm

Borer

These Borers have been found in the stems of Strawberry leaves and the much larger main stems of Hollyhock and various other Plants and weeds.

The Larvae appear to be identical and thrash their front ends around violently when disturbed. 

Some Borers attack roots, some attack stems, some bore through the bark of trees where they may girdle the

Leafhopper

Scale

Spider Mites

A heavy spider mite infestation (Acari) caused the curling, distortion, yellow patches and bronzed patches on the leaves of this tomato plant (Lycopersicon)

Snails/SLUGS

• Slugs can destroy foliage faster than plants can grow. They also feed on fruits and vegetables prior to harvest, making holes in the crops. Slugs bodies are mostly water

and the soft tissue of their bodies are tender and prone to dry out.

Tent Caterpillar

Whitefly

Whitefly is a primary insect pest of many fruit, vegetable and ornamental crops, frequently being found in

Adults are 1-2 mm in length, with yellowish bodies and four wax-coated wings held near parallel to the leaf surface.

White Grub

White grubs can devastate your lawn. White grubs (European chafer, May and June Beetles) are small plump white larvae which actively feed on grass roots. They live below the soil surface and actually chew off the roots of the grass plants. They are C shaped, have a brown head and have 3 large pairs of legs.

DISEASES

Anthracnose

• Anthracnose (Discula spp., Kabatiella apocrypta) is a name for a group of diseases caused by several closely related fungi that attack many of our finest shade trees. It occurs most commonly and severely on sycamore, white oak, elm, dogwood, and maple.

Apple Scab

• The scab-like leaf spots and fruit spots, from which the name was developed, may cause defoliation and reduction in fruit quantity and quality.

Black Spot

Leaf symptoms are roundish, black spots with fringed margins that can be up to ½" in diameter. The spots form on the upper sides of leaves.

The tissue surrounding the spots turns yellow. Infected leaves may prematurely drop from the plant. Usually lower leaves are infected first. Excessive leaf drop weakens the plant, predisposing it to other forms of injury such as those caused by temperature extremes.

Botrytis

Botrytis blight or gray mold is a fungus disease which infects a wide array of herbaceous annual and perennial plants.

Cedar apple rust

• During warm rainy days in late April and early May, cedar trees infected with the cedar-apple rust fungus will develop bright orange, gelatinous galls.

Crown Gall

Crown gall, a disease of roots and stems, occurs on a large number of plants.

Fireblight

Powdery Mildew

WEEDS

Annual Bluegrass

Broadleaf Plantain

Buckhorn Plantain

Bull Thistle

Chickweed

Crabgrass

Dandelion

Field Bindweed

Henbit

Knotweed

Nimblewill

Nutsedge

Oxalis

Prickly Lettuce

Purslane

White Clover

PHYSIOLOGICAL PROBLEMS

Iron Deficiency

Symptoms:Iron-deficient plants are yellow and stunted, with the symptoms expressed on the young leaves first. Affected leaves have interveinal chlorosis, with the leaf lamina at first appearing to be a "healthy" yellow.

Leaf Scorch (drought/winter burn)

Scorch often occurs in July and August, especially on newly planted trees, when the roots cannot supply enough water to offset the water lost through the leaves in transpiration. Hot, dry winds will increase the amount and severity of leaf scorch, especially in the early summer after a cool, wet period.

Symptoms of leaf scorch include yellowing and/or darkening of tissues between the main leaf veins or along the leaf margins, sometimes with dark angular spots in the discolored areas. Entire leaves may become brown and wither when leaf scorch is severe.

Nitrogen Deficiency

The most common plants affected by nitrogen deficiency include fruit trees, vegetable plants and broad-leafed evergreens, although any plant can become nitrogen deficient.

2, 4-D Injury

• The initial symptom is wilting of the plant leaves