Whitening effect
Kill the germs. The quicklime and salt components in the whitening agent have the function of sterilization and disinfection, and can eliminate various kinds of pathogens that overwinter the base of the trunk.
Kill the eggs. Many eggs seem to be in the bark gap, in the trunk of the trunk or dried over the winter, white can eliminate these eggs.
Control pests. Pests that harm fruit trees generally prefer black and dirty places. They do not like white, clean places. After the trunk is painted white, the pests do not dare to climb the tree along the trunk.
Prevent livestock from biting the bark.
Prevent freezing damage. After entering the winter and the spring of the next year, the temperature difference between day and night is large. By whitening, you can reflect the sun and ultraviolet rays in the daytime, reduce the temperature difference between the day and night of the trunk and avoid freezing damage. White-painted trees tend to delay the germination and flowering of trees because of the slower temperature accumulation at the base of the trunk, which can avoid frost damage caused by “cold springâ€.
Prevent sunburn. After the trunk is painted white, it can reflect the bright sunshine and ultraviolet rays during the day, effectively reducing the occurrence of sunburn hazards.
White time
From the end of November to the middle of February of the next year, the trunk can be painted white. During this period, the winter temperature is low, the cold air sinks, the trunk is most vulnerable to freezing damage, and some pest bacteria hide in the cracks of the trunk epidermis over the winter. Whitening the trunk can achieve targeted and multiplier effects, reduce the number of pests and diseases in the coming year, and reduce the workload of pest control.
White painted part
The height of the white coating is 1 to 1.5 meters from the ground. The focus is on the white stems and roots. The large trees, diseased trees and trunks with incomplete crowns should be painted white. Ordinary branches, do not white the branches of the year, so as not to burn the cortex.
Type of whitening agent
One is a whitening agent for the purpose of preventing frost damage. The peach trees in the north of the Huaihe River and the fruit trees in the low-lying orchards are susceptible to freezing damage. Applying whitening agents to the trunks of these fruit trees is equivalent to putting them on winter clothes to form an insulation layer to increase the ability to resist cold and freeze.
It can be used to prepare talc powder whitening agent, 0.5 kg of talcum powder, corn flour or bean noodles 0.5 kg, add 10 kg of water and mix well, and add 0.2 kg of washing powder. It is also possible to prepare lime cement yellow mud whitening agent, 5 kg of water and 2 kg of quicklime. After fully mixing, pour 2 kg of cement and 1 kg of yellow mud in turn and mix thoroughly.
The second is a whitening agent for the purpose of pest control. Before the white coating, the bark within 50 cm above the root of the trunk is scraped off, and the fruit tree with more than 10 years of fragile skin and skin is better. The main skin on the main branch and the main skin are scraped off. Trees, apple trees, light scraping chestnuts, etc., peach, plum, apricot trees are not recommended to scrape, in order to prevent the occurrence of injection disease.
A stone sulphur mixture can be formulated. First, use 10 kg of water and 5 kg of quicklime to fully melt, stir evenly, then add 1 kg of yellow mud, stir, then add 1 kg of 11 Bome stone sulphur mixture, then add 0.5 kg of salt and vegetable oil, stir well. Evenly. It is also possible to formulate a lime sulfur mixture. First, 5 kg of quicklime and 0.3 kg of salt are evaporated with 8 kg of hot water, stirred into a paste, and then 0.3 kg of vegetable oil, 0.5 kg of sulfur powder, 0.2 kg of bean noodles or cornmeal are added, and stirred until uniform.
The third is a whitening agent for the purpose of preventing disease. The frozen fruit trees are susceptible to sunburn and cracked skin due to the decay of the branches and leaves, which induces resin disease. The white coat of the trunk can reflect the sunlight, reduce the temperature of the trunk during the day, and prevent the bark from causing sunburn.
A lime sulfate copper mixture can be formulated. 0.5 kg of copper sulfate is opened in a container with 1 kg of hot water, 5 kg of quicklime and 5 kg of water are turned into lime milk in a container, and finally the melted copper sulfate solution is poured into a container of lime milk. Medium, stir well. It is also possible to prepare a limestone sulphur residue residue whitening agent. Add 5 kg of lime and 0.5 kg of stone sulfur mixture residue to 25 kg, plus 0.1 kg of salt, stir well.
Whitewashing notes
The whitening agent should be used with the equipment, and it should not be used more. The whitening agent after the preparation should not be put on for a long time.
In the process of formulating the whitening agent, each additional ingredient should be thoroughly stirred and evenly distributed to make the whitening agent evenly adhere to the trunk.
Before the fruit trees are painted white, they should be trimmed first, and the cut branches will be collected and burned. The injured parts such as cracks and cracks on the trunk will be wrapped with plastic film.
Observe whether the pests have entered the trunk. If there is, you should use cotton or cotton cloth to dip the pests and then whiten them.
When brushing, use a brush or grass to pick up the whitening agent, and choose the sunny day to evenly coat the base and main stem of the main branch. After the old tree is exposed, in order to prevent sun exposure, the whitening position should be raised, or the whole plant should be painted white.
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