Preparation and application of whitening agent for fruit tree trunk

Painting whitening agent on the trunk of fruit trees can protect against freezing injury, prevent pests from overwintering on the trunk, and kill diseases and insect pests on the trunk. Due to different uses, the preparation method of whitening agent is also different.

First, for the common purpose of anti-freezing. Fragrant pear, apricot, plum, peach, stone and other fruit trees are vulnerable to freezing damage, especially in low-lying areas, white paint on tree trunks every winter is an effective way to prevent freezing. At the beginning of November, for the 4-5-year-old young trees that can not be buried, the trunk should be painted white, and it is best to apply it to the trunk bifurcation. The white coating of young trees can alleviate the temperature difference between the yin and yang of the trunk, and the anti-cold effect is better, which can be applied before the soil is frozen. The formula of whitening agent is: 0.5 kg of salt, 6 kg of quicklime, 15 kg of water, and then add an appropriate amount of adhesive and the residue of stone-sulfur mixture into a paste, smear all over the branches of young trees and old trees after scraping, brush the trunk white from late November to late December. Sunny days can reflect sunlight, reduce the absorption of solar heat, reduce the temperature difference before and after frost injury and the day-night temperature difference on tree trunks, and prevent frost injury.

Second, the main purpose is to prevent diseases and insects from overwintering on the tree trunk. Whitening agent formula: 10 kg of quicklime, 1 kg of salt, 1 kg of stone-sulfur mixture, 40 kg of water, and 0.2 kg of cooking oil. Scrape off the old skin from the trunk and main branches from late November to mid-February of the following year. Pear trees should be re-scraped, peaches and plums and apricots are easy to cause glue flow, be careful to scrape. Plums, pears, peaches and trunks with more than 10 years old have more cracked and warped bark, which have become the overwintering sites for pathogens and pests. Brushing whitening agent can prevent insect pests from invading the bark to lay eggs and pupate, and kill pests and germs attached to the bark, which has the effects of anti-freezing and sunburn.

Matters needing attention

1. The whitening agent for fruit trees should be used as soon as possible and should not be kept for a long time.

two。 When in use, the whitening agent should be fully stirred to facilitate brushing evenly, and make the whitening agent stick to the tree trunk.

3. Before using the whitening agent, it is best to cut off the diseased, weak, aged and over-dense branches of the trees on the streets of the forest garden, then collect them and burn them, and wrap the cracks and cracks with plastic film.

4. In the process of careful inspection, if it is found that there are pests on the branches, cotton should be soaked in medicine to kill the pests before white treatment.

5. When brushing, use a brush or straw handle to dip in the whitening agent, choose a sunny day to evenly whiten the base and trunk of the main branch, and the whitening height is mainly 1.5 meters from the ground. If the old tree is explicitly renewed, in order to prevent the sun, the position of whitening should be raised, or the whole plant should be painted white. Hai Ri Guri