Apply white agent to the trunk of the fruit tree to prevent frost damage, prevent pests from overwintering on the trunk, and kill pests and diseases on the trunk. Due to different uses, the preparation method of whitening agent is different.
First, the common purpose is to prevent frost. Fruit trees such as fragrant pear, apricot, plum, peach and nucleus are susceptible to frost damage, especially in low-lying areas. Applying white agent to the trunk every winter is an effective method to prevent freezing. At the beginning of November, paint the trunk of the young tree that cannot be buried for 4 to 5 years. It is best to apply it to the branch of the trunk. The white cold-proof young tree can be used to relieve the temperature difference between the yin and yang sides of the trunk. The cold-proof effect is better. It can be applied before the soil is frozen. The formula of the whitening agent is: 0.5 kg of table salt, 6 kg of quick lime, 15 kg of clear water, and then add an appropriate amount of adhesive and the residue of the stone sulfur mixture to make a paste. The trunk is whitened from late December to late December. On sunny days, it can reflect sunlight, reduce the absorption of solar heat, reduce the temperature difference before and after freezing damage, and the temperature difference between day and night on the trunk, which can prevent freezing damage.
Second, the main purpose is to prevent the pests from overwintering on the trunk. Whitening agent formula: 10 kg of quicklime, 1 kg of table salt, 1 kg of stone sulfur mixture stock solution, 40 kg of water, and 0.2 kg of cooking oil. From late November to mid-February of the following year, scrape the old skin from the trunk and the main branches. Pears should be scraped heavily, peaches and apricots can easily cause glue flow, and be careful with scraping. Plums, pears, peaches, tree trunks with more than 10 years of age have many cracked skins and warped skins, which have become wintering places for pathogens and pests. Brushing with white agent can prevent pests from invading the bark to lay eggs and pupate, and kill the pests and germs attached to the bark. It also has the functions of preventing frost and sunburn.
Precautions for use
1. The whitening agent for fruit trees should be used with each other, not for a long time.
2. When using, the whitening agent should be fully stirred to facilitate brushing and make the whitening agent stick to the trunk.
3. Before using the whitening agent, it is best to cut out the diseased, weak, aging and overdense branches of the trees in the forest garden street trees, and then collect them for burning, and use plastic for the cracked and frozen places. The film is bandaged.
4. In the course of careful inspection, if it is found that harmful insects have invaded the branches, use cotton soaking to kill the insects and then apply white coating.
5. When brushing, use a brush or a straw to dip the whitening agent, choose a sunny day to evenly coat the base and trunk of the main branch, and the whitening height is mainly 1 to 1.5 meters above the ground. If the old tree is barely renewed, in order to prevent the sun, the whitening position should be raised, or the whole plant should be whitened.
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