When the trunk is whitened, the focus of use is different, and the formula of the whitening agent is also different. Here are a few commonly used whitening agent formulas.

Whitening agent for the purpose of preventing frost damage

Talc whitening agent: 0.5 kg of talc powder, 0.5 kg of corn flour or bean noodles, add 10 kg of water and stir well, and 0.2 kg of washing powder can be added to increase the adhesion of the whitening agent.

Lime cement yellow mud whitening agent: 5 kg of clean water and 2 kg of quicklime, after fully mixing, pour 2 kg of cement and 1 kg of yellow mud in sequence, and fully mix into a slurry. This kind of whitening agent is resistant to rain erosion and can Keeping on the bark for one year does not fall off, and it can also prevent the occurrence of infectious diseases.

Whitening agent for pest control

Lime-sulfur mixture liquid: first use 10 kg of water and 5 kg of quicklime to fully melt, and stir evenly, then add 1 kg of yellow mud in sequence, and then add 1 kg of Lime-sulfur mixture with a Baume degree of 11 degrees, and then add Each 0.5 kg of salt and vegetable oil, stir well. Lime and lime sulphur mixture can kill pests and insect eggs that overwinter in the cracks of the bark, and salt can prevent the whitening agent from drying out and falling off, and has an adhesive effect.
Lime sulfur mixture whitening agent: first melt 5 kg of quicklime and 0.3 kg of salt with 8 kg of hot water, stir into a paste, then add 0.3 kg of vegetable oil, 0.5 kg of sulfur powder, 0.2 kg of bean noodles or corn noodles. Stir while adding until uniform. Lime and sulfur powder can prevent freezing and disease and insect pests. Table salt can make lime and sulfur powder penetrate into the skin of the tree trunk to retain moisture and prevent dry cracking. Vegetable oil and bean noodles enhance the adhesion of the whitening agent on the trunk.

Whitening agent for disease prevention

Frozen trees are susceptible to sunburn and cracked bark due to the fall of branches and leaves, which can induce resin disease. The white trunks can reflect sunlight, lower the temperature of the trunk during the day, and prevent the bark from cracking and causing sunburn.

Lime copper sulfate mixture: use 1 kg of hot water to open 0.5 kg of copper sulfate in a container, then 5 kg of quicklime and 5 kg of clear water are converted into lime milk in a container, and finally pour the melted copper sulfate solution Put it into the lime milk container and stir well.

Limestone-sulfur mixture residue whitening agent: add 25 kg of water to 5 kg of lime and 0.5 kg of lime-sulfur mixture residue, plus 0.1 kg of salt and mix well.

Precautions for using whitening agent:

1. The whitening agent should be used with the preparation, and should not be left for a long time.

2. It is advisable to stir the whitening agent fully during use to facilitate the brushing evenly and make the whitening agent adhere to the trunk tightly without flowing down, forming lumps, not warping or falling off after drying.

3. Before using the whitening agent, first cut off the diseased branches, weak branches, aging branches and dense branches with branch shears, and then collect them for burning, and use the broken and frozen branches Wrap up with plastic film.

4. In the process of careful inspection, if harmful insects have been found on the branches, use cotton soak to kill the insects before whitening.

5. Whitening agent cannot be used together with insecticides or fungicides. Whitening agents are alkaline substances, and most insecticides and fungicides are acidic. Mixing insecticides or fungicides into whitening agents can easily cause acid-base neutralization and fail to work.

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