What is the effect of whitening fruit trees? When will it be painted white? How to paint it white?

I believe many friends can often see that the roadside trees, the greening trees of the park, and the fruit tree trunks of the orchard have all been painted in vain for some time. What is the use of whitening the fruit trees? When will it be painted white? How to paint it white?

What is the effect of whitening fruit trees?

1. Kill germs.

The quicklime and salt ingredients in the whitening agent have the effect of sterilization and disinfection, which can eliminate all kinds of bacteria overwintering at the base of the trunk, and accelerate wound healing after whitening.

2. Kill the eggs.

Many insect eggs like to survive the winter in the cracks in the bark and inside the warped bark of the trunk and longicorn beetles. White painting can effectively eliminate these eggs.

3. Prevention and control of pests.

Pests harmful to fruit trees generally like dark, dirty places, do not like white, clean places, the trunk whitening agent after the pests do not dare to climb along the tree harm.

4. Prevent livestock.

After the trunk is painted white, it can also prevent the bark from being bitten by animals.

5. Prevent frost injury.

From the beginning of winter to the beginning of spring of the following year, there is a big temperature difference between day and night. By whitening, sufficient sunlight and ultraviolet rays during the day can be reflected, the temperature difference between day and night at the base of the trunk can be reduced, and frost injury can be avoided. Because the temperature at the base of the trunk accumulates slowly, the white trees often delay the sprouting and flowering period, which can avoid frost damage caused by "late spring cold".

6. Prevent sunburn.

After the trunk is painted white, it can reflect the bright sunlight and ultraviolet rays during the day, which can effectively reduce the occurrence of sunburn.

When will the fruit trees be painted white?

Generally, the trunks of fruit trees are painted white before the Beginning of Winter after fruit harvest. The trunk of fruit trees is painted white, which can resist cold, keep warm and kill diseases and insect pests. Especially the fruit trees in the full fruit period.

How to paint fruit trees white?

1. Copper sulfate lime whitening agent

a. Copper sulfate 10 kg, quicklime 200 kg, water 600-800 kg.

B, modulation method:

(1) fully dissolve copper sulfate with a small amount of boiling water, and then dilute it with 2/3 of the water used.

(2) add the quicklime and the remaining 1/3 water to slowly mature the strips into concentrated lime milk.

(3) when the above two liquids are fully dissolved and the temperature is the same, pour copper sulfate into the lime milk and stir it evenly.

(4) it is suitable for peach, plum, pear, apple, bayberry and other fruit trees.

2. Lime sulfur whitening agent

Configuration method:

(1) 100 kg of quicklime, 1 kg of sulfur, 2 kg of salt, 2 kg of animal and vegetable oils and 400 kg of hot water.

(2) quicklime in ingredients requires white color, light weight and no impurities. The finer the sulfur powder, the better.

(3) first dissolve the sulfur powder and salt in hot water of 40-50 degrees, and add a small amount of washing powder to the sulfur powder liquid.

(4) slowly stir the quicklime in boiling water of 80-90 degrees and fully dissolve.

(5) mix lime milk and sulfur milk fully, and add salt and oil ester to stir well.

(6) suitable for peach, plum, pear, apple, bayberry, citrus and other fruit trees.

3. Stone-sulfur mixture quicklime whitening agent

A: proportioning method: 0.5 kg of stone-sulfur mixture, 0.5 kg of salt, 3 kg of quicklime, appropriate amount of oil ester, 10 kg of water.

B: the preparation method: add quicklime to water to mature, add oil ester to stir, add water to make lime milk, and then pour into the original liquid of stone-sulfur mixture and salt water to stir evenly.

Suitable for peach, plum, pear, apple, bayberry, citrus and other fruit trees.

4, lime yellow mud whitening agent.

A: the proportion is 100 kg of hydrated lime and 120 kg of yellow mud.

B: preparation method. The cooked lime yellow mud is mixed with water and mixed into a slurry, and an appropriate amount of insecticides can be added to control the overwintering pests of tree stems.

Suitable for pears, apples, bayberry, oranges and other fruit trees.

5. matters needing attention in the use of whitening agent:

A: the whitening agent for fruit trees should be used as soon as possible, not for a long time.

B: stir evenly when in use to facilitate brushing and apply the whitening agent evenly on the tree trunk.

C: remove pests, especially galls, from the trunk before brushing.

D: the base of the trunk should be evenly whitened on a sunny day, and the whitening height should be 1.5 meters above the ground.

E: if the old tree is renewed by high grafting, in order to prevent the sun, the whitening position should be raised or the whole plant should be whitened. The above methods can play an effective role, and the majority of fruit farmers can choose according to the actual situation.