Pointers on Applying Flower Inducer to Mango Trees

imultaneous fruiting is possible nowadays with flower inducer. By spraying it to mango trees, not just more, but bigger fruits are produced.

Potassium nitrate is the generic name of chemical flower inducer in mango, and the chemical symbol for this compound is or KNO;. It contains 13% nitrogen and 46% potash, hence it is also called 13-0-46. KNO supplies the potassium requirement of the tree and in the process, induces flowering.

Another flower inducer used, nowadays is calcium nitrate (CaN). It contains 45% calcium and 15% nitrogen. It is affordable, yet the effect is just the same.

Here are some pointers on applying flower inducer to mango trees.

1. Flowering and fruiting vary, depending on the variety.2. Chemical flower inducers should not be used under the following circumstances:

• when the tree is 10 years old or below• when the leaves and buds are young• when the tree is weak and sickly• during rainy days

3. High dosage of flower inducer should be applied when the tree is healthy and starting to mature, the leaves and buds are maturing, and the weather is cloudy.4. Use low dosage of flower inducer (1% – 2% of KNO;) when the tree is already mature, healthy, and has dormant buds; the leaves and buds are mature; and the weather is sunny.5. Induce flowering once a year. However, if it did not flush during the fruiting time, spray again after harvest, but do not expect full bloom.6. Spraying should be done when the tree and leaves are dry, and with no expected rain within the next six hours.7. Use Apsa-80 as sticker.8. Using the same formulation, spray again after two days to hasten the emergence of flowers.9. From flowering to harvest, it takes 7 to 8 months to rejuvenate and accumulate nutrients for the next fruiting season.10. Trees that have yielded in the previous season but have not flushed can be induced, but do not expect a full bloom.

In spraying potassium nitrate, prepare a 1% – 3% solution, depending on the condition of the tree. Or, mix 4 kilos per 200 liters of water. Spray it onto the leaves and branches, totally wetting but not dripping. Spray early in the morning (from sunrise to 9:00 a.m.) or late in the afternoon (from 4:00 p.m.-6:00 p.m.) to prevent leaf burning due to sunlight. In applying CaN, one one hand, mix 5 kilos to 200 liters of water.

After 12 days, when the flowers start to emerge, spray pesticide and fungicide. The flowers would be fully opened after 20 days. At this time, the flowers are susceptible to pest, so inspect the plants every day to see if there are damages caused by insects, and spray appropriate pesticide.

Applying flower inducer at the right time and amount indeed results in significant increase in production. One mango farmer in San Roque, Digos City, Davao del Sur who uses inducer is Arnold Nebria. In fact he is the first one in San Roque who has succeeded in mango farming. At present, he grosses an average of PI million every harvest. Also applying inducer is Victorino Ramos, and in September 2008 this 70-year-old farmer and councilman of San Roque has earned almost P1 million.

In the same year, I grossed P960,000 from my 2-hectare lot planted to grafted Cebu Mango; and it was the biggest income that I ever earned in my entire life! So consider the said tips on using flower inducer, and you, too, would have a hefty profit.

Here is a instruction of a flower inducing agent called Haifa (Potassium Nitrate):When to spray:1. Age of three:KNO3 (Potassium Nitrate) should be applied to physiologically mature mango trees.  Those that have not reached the reproductive  phase will not flower despite KNO3 application.2. Age of shoot/leaves:Mature leaves are more responsive to KNO3 than younger ones.  After flushing, leaves should grow and develop for about 7-9 months. A practical guide to identify mature leaves in the fields is the copper green to brown color, brittle texture and crispy appearance.3. Presence of dormant buds:They should be visible on the tip of the twigs as plump and convex protrusions. Non-dormant buds are conclave in appearance.RATE OF APPLICATION:It has been reported that concentration as high as 16% KNO3 have been used to induce flowering mango without any phytotoxic effects.  In practice, the recommended concentrations for induction varies from 1-3% KNO3.  In the Philippines, the reco0mmended rate varies with the season:Wet months (Off-season) July to November: 2 to 2.5 percent KNO3 is recommended (2-2.5 kg of KNO3 in 100 liters of water).Dry months (December to MAy): a lower concentration of 1 to 1.5% KNO3 is recommended. (1-1.5 of KNO3 in 100 liters of water).SECOND APPLICATIONOftentimes, if flowering is poor or does not occur, a second spray using low concentration of KNO3 should be applied.  This procedure can increase flowring in mango.RAINFALLThe uptake of KNO3into the leaves is extremely fast.  Consequently, rainfall after spraying has negligible affect provided leaves are dry during and imediately following spray aplication of Haifa Pottasium Nitrate.FOLIAR FEEDINGAny Fertilizer applied to the tree via the soil cannot be utilized by the developing flowers: hence, foliar spray in needed. When Haifa Potassium nitrate is sprayed on the tree it becomes a fast and effective source of potassium and nitrogen.It is recommended to spray twice. Apply 1 to 2% KNO3 solution each application at about 42 and 65 days after induction.  The first application at about 42 and 65 days after induction.  The first application is done to encourage fruit setting and minimize fruit drop. While the second application is to increase fruit size.

Suggestions to have increase in fruits and save in pesticide and insecticide and fungicide:-after harvest prune the unwanted branches and twigs espeically the dead ones and sprouting stems.-after harvest apply 1-2 bag dry chicken manure or organic fertilizer each tree plus complete fertilizer to feed to the tree. (I advice using chicken manure because 1 bag cost 20 pesos each more cheaper than compost)-after flower inducing the mature trees, I suggest you bag the mangoes at the fruit set usually this takes 40 days after flowering inducement.  This is better to less the cost on pesticide and insecticide. (If you're trees are very tall, I suggest you bag the fruits in the lower portion where can easily bag them for export quality pursposes)-Remember it is importnat you feed the tree after harvest of fruits as it already lost it nutrients in the ground that were fed to the fruits for development. -You will never flower a mature tree if the tree is not well fed.  I suggest you apply organic fertilizer 3 times a year, before rainy season, after rainy season and after harvesting.  This will gurantee a good harvest plus complete fertilize in the ground.-Do not over flower induce the tree because this is the cost why some mangoes die at a early age because of flower inducer overdose.I hope I helped in my own little way because this is mostly the problem of mango growers in our country.

MANGO 

Introduction

Prospects and Strengths

Mango growing is in line with the initiatives of both government and private sectors in terms of production, processing and marketing support

Once productive, a 10-15 year old tree will yield approximately 500 kilos There is a niche market for both fresh and processed mangoes locally and abroad. The export

market is expanding Technologies from propagation to post-harvest handling have been tested,verified and adopted

nationwide Processing technologies are also available and continuing efforts are exerted to develop new

products There is a pool of experts in the country that can be tapped to provide technical assistance to

mango growers and processors Research and development activities on emerging pests and diseases are given priority by

relevant agencies of the government Expansion of large production areas in Mindanao which are free from typhoons

Favorable Growing Conditions

Elevation: within 600 meters above sea level (400 m considered ideal) Temperature: 21°C-27°C Weather for inducing maturity of vegetativeparts and flowering: distinct wet and dry (3 to 5

months-dry) Weather for fruit development: plenty of sunlight Ideal soil: loamy, relatively high in organic matter Soil pH: 6.0 to 7.0 Soil texture: good water holding capacity Topography: flat to rolling, not exceeding 45 degrees gradient Drainage: well-drained soil; less moisture level needed during maturation of leaves and buds,

flowering, fruit set and ripening Distance of planting: depending on variety

 

Popular Varieties

1. CARABAOo originated from India, Burma and Malaya (Indo-Burma region)o tree has coarse, large and conical trunk with shallow and small cracks on bark, canopy

dome shapedo fruit is elongated and kidney-shaped, weighs about 240 grams, with thin, yellow pulp,

very tender taste and slight aroma2. PICO

o originated from India, Burma and Malaya (Indo-Burma region)o tree has upright growth, open crown; has deeper cracks on barko kidney-shaped fruit weighing about 230 grams; distinct beak on the apex, flesh is fibrous

and thick, light orange yellow and sweeter than ‘Carabao’ variety

3. KATCHAMITAo originated from Indiao has compact crown and lower tree stand than ‘Carabao’ and ‘Pico’o fruit is small to medium, rounded/oval, green skin with yellowish flesh and preferably

eaten as green

Propagation Practices

There are two methods of propagating mango, namely, sexual and asexual propagation

A. Sexual propagation

– Growing of rootstocks

1. Extract seeds from ripe fruits2. De-husk seeds to hasten germination3. Sow the seeds in seed boxes or elevated plots. The ideal medium is a mixture of one part

compost and the one part garden soil. Composting materials like sawdust, coconut coir dust, rice hull and other similar organic materials can also be used.

4. Water seed boxes or seed plots to maintain enough moisture. Provide drainage for excess water.

5. Transfer seedlings with 2 to 3 leaves in black plastic bags (7”x11”) filled with garden soil mixed with decomposed organic materials.

Note: Seeds germinate in 10-15 days from planting.

6. Apply fertilizer (16-20-0 mixed with urea) 30 days after potting at the rate of ¾ teaspoon per bag.

7. Thereafter, spray foliar at weekly intervals.8. Apply fertilizer again (same as step 6) every 30 days.9. Spray with pesticide when the need arises. Most common problems are scale insects,

cecid fly, corn silk beetle and anthracnose.10. Rootstocks are ready for grafting upon attaining “pencil size” stem diameter (10-12

months germination).

B. Asexual propagation (grafting, budding, inarching, etc.)

Through Grafting

1. Grow the rootstock seedlings up to pencil size diameter (8 to 12 months)2. Get mature scion (pencil size with plump end) from healthy mother trees having superior

characteristics3. Remove the leaves and clean the scion. Immediately place inside plastic bag to prevent

transpiration and drying up4. Cut the stem of the rootstock preferably at the tender joint near the active growing shoot

one foot from the base. Make an incision, ¼ inch deep from the cut, at the center of the stem

5. Make a clean V cut at the base of the scion6. Insert the scion’s V cut base at the incision of the rootstock, seeing to it that the cambium

layer or skin of both the scion and the rootstock meet7. Bind them together gently but firmly with plastic tape. Wrap the entire scion from the

joint to the tip to prevent drying8. Place the newly grafted seedlings in partly-shaded environment

9. Water regularly until flushing (appearance of new leaves) occurs. This is usually observed in 15 to 20 days

10. When this happens, remove the plastic strip that covers the tip to enhance growth. Leave the strip that binds the joint.

11. Grafts are ready for disposal after 8 to 10 months. Hardening is however, recommended prior to field planting

12. Grafts not sold after 1 year should be re-bagged using bigger plastic containers

 

Land Preparation

1. Prepare lay-out of the farm

There are four lay-outs to choose from:

i. Square system (how tos)ii. Triangle system (how tos)

iii. Quincunx system (how tos)iv. Contour system (how tos)

2. Place stakes (markers) at the site of the planting3. Dig one cubic meter hole and refill with fertile soil (usually soil mixed with decomposed organic

materials and fertilizer).4. Pour water into the hole and allow the water to be absorbed by the soil.5. Remove the plastic bag carefully.6. Plant the graft in the center and cover the hole with the remaining soil.7. Protect the newly-planted graft from intense heat by providing shed using coconut leaves.8. Apply mulch to conserve soil moisture.

 

Crop Establishment

Distance of Planting

Factors to consider:

topography of the land development program of the farm variety soil fertility planting of intercrops – kinds of intercrops (to include a table containing recommended distance of planting and total number of trees per

hectare using different systems of planting)

Pruning and Thinning

As a general rule, the farmer should begin pruning and thinning when the crown or foliage of the trees starts to meet. Pruning is the removal of undesirable vegetative parts of the tree, usually the crowded branches. Insect-infested and diseased branches, leaves, flowers or other plant parts need to be removed also.

An integral part of pruning is training the canopy to a manageable size, shape and height.

Type of Canopy Training:

open center formative modified ladder conventional Dwarfing

Pruning is done to allow sunlight to penetrate in the crown and free air circulation, thereby reducing incidence of insect pests and diseases. In general, pruned trees produce bigger and high quality fruits compared to unpruned trees.

The best time to prune is after harvest. When done during summer, the wounded parts dry and heal faster.

 

Other Considerations when Pruning

1. Select only the parts to be pruned (minimal pruning)2. Cut small branches first followed by large branches (minimal pruning only)3. Always make a clean cut at the base of the branch and avoid leaving stumps where unwanted

water sprouts may grow4. Paint or spray the open cut with fungicide, tar or disinfectant when pruning is done during wet

season5. Remove all debris and maintain cleanliness of the surrounding areas.

 

Nutrient Management

In the first five years, the trees need high rate of nitrogen fertilizers. To promote faster vegetative growth, organic fertilizer application is also recommended. As the trees reach bearing age, more emphasis should be given on phosphorous and potassium. Phosphorous fertilizer promotes root and flower development while potassium is for fruiting and ripening. Apply fertilizer containing 4-5% phosphoric acid and 8-15% potash.

 

Important Considerations in Fertilizer Application:

1. When applying fertilizer, dig a few holes (6-8 holes) around the tree or a canal within the area covered by the canopy. For big trees, follow canopy drip line.

2. The zone of maximum and efficient utilization of fertilizers is 30 deep and 100 cm from the trunk of 5-10 year old trees. This goes a little farther as the tree crown becomes wider

3. The preferred time of fertilizer application for non-bearing trees or at the juvenile stage is at the start and before the end of the rainy season, when the soil is still wet. Fertilizer can also be applied during the dry season if there is irrigation.

4. The procedure for fertilizer application is similar for both bearing and young trees.5. At flowering, spraying of foliar fertilizer is recommended as supplement.

 

Flower Induction

In inducing mango trees to bear flower, the following should be considered:

1. Different mango varieties have varied flowering and fruiting habits. The ‘Carabao’ variety under normal conditions bears fruits every two to three years.

2. Chemical flower inducers should not be used under the following circumstances:

o When the tree is too small or still youngo When the leaves and buds are youngo When the tree is weak and sicklyo During rainy dayso Just after harvest or when the tree has fruits or is in flushing stage

3. High dosage of flower inducers (2.0 to 3.0% KNO3 ) should be used when:

o Trees are just starting to matureo Leaves and buds are maturingo The tree is healthy with vigorous buds and leaveso During cloudy weathero Sprayed six to seven months after harvest

4. Use low dosage of flower inducers (1.0 to 2.0% KNO3 ) when:

o Trees are big, old or fully matureo Leaves and buds are fully matureo Tree is healthy with dormant budso Sprayed during sunny weathero Sprayed seven to nine months after harvest

5. Induce flowering only once a year6. From flowering to harvest, it takes 7-8 months to rejuvenate and accumulate enough nutrients for

the next fruiting season7. Trees that bear fruits last season but have not flushed should not be induced to flower8. Spraying should be done when the tree and leaves are dry and with no expected rain within the

next 6 hours

Potassium nitrate is the generic name of chemical flower inducer in mango. The chemical symbol of this compound is KNO3. This contains 13% nitrogen and 46% potash, thus, 13-0-46. When sprayed, it supplies the potassium deficiency of the tree and in the process, induces flowering.

When spraying potassium nitrate, follow this simple steps:

1. Prepare a 1-3% solution depending on the condition of the tree.2. Spray the leaves and branches totally wetting but not dripping.3. Spray early in the morning (from sunrise to 9:00 am) or late in the afternoon (from 4:00 pm to

5:00 pm). This prevents leaf burning due to sunlight.

 

Water Management

For young mango trees, weekly manual watering should be done during dry months by saturating the soil with enough water followed by mulching. If drip irrigation is available, fertilizer application can be incorporated in the irrigation water.

For flowering trees, apply water weekly during flower initiation and fruit development and stop one month before harvest. Irrigate developing flowers and fruits to enhance fast development, minimize fruit drop and increase fruit size. The volume of water ranges from 60 to 100 liters per tree depending on size.

 

Pest Management

Fruit Protection

Wrapping or bagging of fruits is practiced in many areas because of the following:

Minimizes incidence of fruit fly and other fruit insects Minimizes disease (fungal) infection Reduces incidence of mechanical damage Paper used serves as absorbent for latex flow during harvest Results to cleaner fruit skin and more attractive light green color Provides an estimate of harvestable fruits per tree

In general, bagging is recommended to protect fruits from pests and to reduce spraying of insecticides. This practice is done when fruits are about chicken’s egg size (55 to 60 days after flower induction)

 

Insect Pests

1. Mango leaf hopper

Damage: Sucking of plant sap causes withering and drying of tender shoots, flowers and very young fruits. In the process, insect secretes sticky fluids (honeydew) that promotes development of sooty mold, fungal disease.

Control: Spray recommended chemicals starting from flower/bud formation to fruit setting. Confidor is effective against hoppers.

2. Mango tip borer

Damage: Shoots wilt and terminal parts die. If infested, panicles break and the flowers shed off.

Control:

o  Prune dead branches to discourage spread of insect. Burn parts that are affected.o  Since the adults start to destroy the flowers from the bud emergence to elongation, it is

necessary to spray insecticides to protect these stages especially during hit months. Insecticides used for mango hopper control are also recommended for tip borer.

3. Twig cutters

Damage: This is very destructive during the dry season. When present, the number of flowers that will be formed is reduced. The most visible indication of the problem is the presence of dead twigs and leaves in the canopy.

Control:Pruning and burning e dead branches to discourage spread of insect. Protect flushes from adults by spray application of insecticide.

4. Pulp weevil

Damage: This is a unique pest since the larvae of the insect feed inside the fruit and destroy the pulp, yet the peel has no visible damage even up to harvest. The insect is present only in some parts of Palawan.

Control:

a. Pruning of crowded mango trees allowing light to penetrate in the canopy is unfavorable to the weevil. Dead or overcrowding branches should be removed.

b. Keep each tree free from weeds, fallen leaves, fruit droppings and other debris. Cultivation of soil is advantageous since this exposes and kills the weevil hidden in the soil after harvest. Burn infested fruits to eliminate sources of infestation during the next fruiting season.

c. For chemical control, Cypermethrin at 50 ml/100 li water provides good protection against the weevil. Fenvalerate and Carbaryl are also effective against the pest. The insecticide should be applied at 14 days interval from fruit set to full development of the fruits.

Note: Insecticides are not effective once the pest is inside the fruit.

5. Mango fruit fly

Damage: Adults lay eggs on mature fruits and larvae feed on the flesh. Affected fruits drop to the grown and are easily contaminated by microorganisms.

Control: Bagging, collection and proper disposal of fallen fruits and harvest at the proper stage of maturity. If chemicals have to be used, spray at 90 or 110 days after induction.

6. Mealy bugs

Damage: Attack newly-flushed leaves, flowers and fruits and suck vital plant saps. Affected parts turn yellow, dry up and eventually fall.

Control:Removal of infested fruits, flowers and leaves. Spray insecticides to kill ants associated with mealy bug.

7. Capsid bug

Damage: Attacks young leaves, twigs and fruits. Saliva of the insect is very toxic and the site of the puncture is marked by sunken blister. The lesions turn brown after 24 hoursbecoming black and scabby in 2-3 days. Infected young fruits fall prematurely. Locally, the damage is called ‘kurikong’ or ‘armalite’ or ‘buti’.

Control:Prune trees before induction, underbrushing areas around the tree, spray insecticide late in the afternoon and remove alternate hosts like cashew, guava and cacao.

8. Mango cecid fly

Damage:Adults, which are mosquito-like in appearance, lay eggs on new flushes. The larvae mine the leaves producing galls or swelling of tissues. Heavy infestation results to wrinkling of the leaves; the leaves remain yellow in color. Close examination of the leaves shows dark green, circular galls randomly distributed on the leaf blade.

Control:

a. Prune or cut infested leaves and burn.b. Practice orchard sanitation. Underbrush weedy areas since adults stay in these areas.c. Spray either Sevin, Decis, Karate or Stingray (3-4 tbsp per 16 liters water) to minimize

damage.

9. Scale insect

Damage: In nurseries, leaves of grafted mangoes are readily infested with scale insects, causing them to dry and fall. On bearing trees, high populations of the insect cause blackening of canopy due to the growth of the fungus ‘sooty mold’. Affected leaves become covered with thin, black papery film which produces unsightly appearance. In addition, affected branches are deformed producing gall like protruberances.

Control:

a. Young scale insects are carried and distributed by red ants to different parts of the tree. To prevent infestation, destroy ants by spraying Malathion at 1 ½ tbsp per 16 liters water, Decis at 1-5 tbsp per 16 liters water or Karate at ¾ - 1 ½ tbsp per 16 liters water.

b. Prune and burn heavily infested plant parts like branches and leaves. This should be followed by spray application of insecticides recommended for this pest and application of high dose of nitrogen.

 

Important Diseases

1. Anthracnose

Damage: This is the most prevalent and destructive disease of mango both in the field and after harvest. Symptoms are exhibited not only on the fruits bust also on flowers and leaves.

Prevention and Control:

a. Field sanitationb. Prune infected branches, burn them and bury the trashc. Schedule flower induction after the rainy season or during the dry monthsd. Include insecticide and fungicide when spraying flower inducere. Wrap the fruits 50-60 days after flowering to protect them from pests and diseases.f. After harvest, practice hot water treatment

2. Stem end rot

Damage:This is another post-harvest disease of mango and appears during storage and transit. The disease occurs only in ripened fruits.

Control Measures:

a. During harvest, leave one centimeter pedicel attached to the fruit to avoid too much latex staining. The casual organism germinates and grows in the presence of latex.

b. Pack mangoes in boxes of two layers to avoid injury due to compactionc. Do not use organic materials during packing

3. Scab

Damage: The disease occurs in nurseries and during moist weather. Damage occurs while fruit is still green

Control Measures:The methods of control are similar to that of anthracnose. However, scab is effectively controlled using copper fungicide.

4. Gummosis

Damage: This fungal disease causes stem bleeding, crown and root rot. Infection may start during the seedling stage and may appear during both dry and wet season.

Control Measures:

a. Plant in well-drained soil.b. Disinfect nursery sites before planting with methyl bromide, Chloropictin or other

fungicidesc. Avoid too close planting to allow aeration and ventilation.d. Remove dirt, weeds or trashe. Avoid dumpy soils for long duration at the base of the trees.f. Cultivation to aerate the soil is necessary to reduce fungal infectiong. Prune crowded branchesh. Foliar spray of ethyl phosphate metaxyl ot prosethal at 2g per liter water every 80 daysi. Drench infected parts, exposed damage and cover with slurry of fungicide

5. Sooty mold

Damage:The causal organism (fungus) develops in the presence of honeydew excreted by insects like hoppers, scales and mealy bugs. As such, it stains the fruits and makes them look dirty and unattractive.

Control Measures:Spray insecticide to kill hopper, scales and mealy bugs. Bag fruits at 60 DAFI.

 

Integrated Pest Management

This involves the following practices:

a. Planting of healthy seedlings.b. Proper land preparation and cultivation. This includes clearing and removal of infected plant

residues in the field and exposing the soil to direct sunlight. This will help eliminate soil-borne pathogens.

c. Proper irrigation and drainage to avoid water logging and reduce water-borne diseases.d. Correct distance of planting and row orientation. This will allow maximum sunlight penetration,

aeration and ease of farm operations such as pest and disease control, cultivation, plowing, smudging, fertilizer application, harvesting, etc.

e. Introduction and maintenance of natural enemies and other biological control methods like entomophagous fungi against mango hoppers. Intercropping with trees that can repel harmful insects and serve as wind breaks.

f. Application of recommended fertilizers and soil conditioners, maintain the right pH of 6-7.g. Practice of clean and sanitary culture. This includes pruning, weeding, thinning, cultivation and

burning of infested debris.h. Using insecticides and fungicides derived from plant extracts like neem, china berry and custard

apple.i. Use of baits and light traps for fruit pest (fruit fly and borers).j. Monitoring of pest population and application of pesticide only when necessary.k. Combine cultural, biological and chemical means to minimize pests.

 

Harvest Management

The following are the indications that mango fruits are ready for harvesting:

1. At 110 days (for very warm and dry environment), 120 days (warm climate) and 130 days (cool and high elevation) after flower initiation;

2. When the flesh is turning yellow;3. When powdery deposit or “bloom” on the surface of the skin is detected;4. When fruit has flattened shoulders at the stem end; or5. When the pedicels of fruits turn dark green to brown in color;6. 75% mature fruit samples sink when submerged in 1% salt solution

Harvesting by hand is the most effective way in order to avoid bruises or damage of the fruits. The best time to harvest is between 9:00 am and 3:00 pm since the tree and fruits are dry and the latex flow is minimal. Harvest with pedicel intact (1.5-2.0cm).

Trim off pedicels and let the latex dry before packing.

 

Post-Harvest Treatments

In order to sell quality fruits, the following post-harvest treatment are practiced:

1. Washing of fruits in water- To remove dirt on the surface.

2. Hot water treatment- This involves heating dipping the fruits for 5 to 10 minutes in heated water (52-55°C). This is followed by hydro-cooling (washing in cool water) and air drying.

3. Vapor Heat Treatment (VHT)- This involves heating the fruit with water vapor saturated air until the fruit pulp reaches 46°C for 10 minutes.

 

Ripening of Fruits

Fully mature fruits may be induced to ripen faster and with uniform color. There are two ways to do this:

1. Use of calcium carbide (‘kalburo’) at the rate of 5 to 6 grams per kilo of fruit. This is done by wrapping the calcium carbide in paper or leaves and placed at the bottom of the container. The container should be covered for 2 to 3 days. For best result, allow fruits to produce yellow color and place ‘kalburo’.

2. Use of ethylene gas or ethyl water solution. The use of ethylene gas involves a chamber while in ethyl solution, the fruits are simply dipped in the solution.

 

 

References:

HVCC. 2001. Mango, Techno-Guide For Mango In The Philippines.