Introduction of trunk whitening technology

1. The main purpose of painting fruit tree trunks is to prevent fruit tree pests from overwintering and protect fruit trees. Therefore, the painting work must be completely completed before the cold air invades. White coating is late, pests have moved up and down, and it is hard to prevent, so it is generally suitable for11~ 65438+February.

2. Whitening agent should be prepared according to a certain proportion. The components of whitening agent are generally composed of quicklime, salt, sulfur (stone sulfur mixture) and water. Lime and sulfur can prevent freezing, burns, diseases and insects, and the mixture of lime and sulfur has bactericidal effect. Salt helps lime to penetrate into bark, keep moisture and prevent lime from cracking and peeling, so the preparation of whitening agent needs lime, salt and sulfur or a mixture of lime and sulfur. Generally 100 kg of water is added with 20 ~ 30 kg of quicklime, 2 ~ 3 kg of sulfur powder and 0/~ 2 kg of salt. First, melt the quicklime, then add sulfur powder and salt, stir well, and then smear it on the bottom of the trunk.

3. Before using whitening agent, it is best to scrape off the rough skin and moss on the bark and block the old tree hole. The bark seam is a good place for insects such as scale insects to overwinter. It should be scraped clean and then coated with white agent. In the process of painting, if pests are found on the branches, they should be killed first and then painted white.

The height of painting should depend on the size of the tree. Usually the painting height is 0.6 ~ 1.5m from the ground. The painting height is consistent, which looks better.

5. Whitening agents cannot be used together with pesticides and fungicides. Although some pesticides, fungicides and brighteners have the same goal, they all aim at controlling pests and diseases. Whitening agents are alkaline substances, while most pesticides and fungicides are acidic substances. Adding pesticides or fungicides to whitening agents is easy to cause acid-base neutralization and can't kill pests and bacteria.

6. The standard of painting is generally that the concentration of painting can't flow downwards, stick a knot in one's heart, cock after drying and fall off. Whitening must be uniform, especially bark cracks, holes and branches, to avoid brush leakage.