First, the whitening of the branches can be carried out all year round. The anti-freezing should be carried out before the cold weather; the anti-branch sunburn should be in the late May to June before the summer; the pests such as the anti-day larvae should be laid before the adult emergence. April to May, white; peach, apricot, plum and other early flowering trees, whitening the branches before germination in early spring can slow the temperature of the tree, delay sprouting and flowering (generally 3-5 days delay) to avoid The early spring flowering period is affected by freezing.

Second, the preparation and use of common whitening agents.

1. Lime sulfur four-component agent. Take 8 kg of quicklime, 1 kg of sulfur powder, 1 kg of salt, 0.1 kg of moving (plant) oil, and 18 kg of hot water. First, the quicklime is disintegrated with 9 kg of water, and the salt is dissolved with 9 kg of water. Then, the prepared lime milk and the saline solution are uniformly mixed, and the fat and sulfur powder are added, and the mixture is thoroughly stirred and prepared.

2. Lime copper sulfate mixture. Take 10 kg of quicklime, 0.5 kg of copper sulfate, and 25 kg of water. First use the appropriate amount of hot water to dissolve the copper sulfate, and dilute it with water to form a solution, and then add the quicklime to the water to form a thick lime milk. Then, the dilute copper sulfate solution is poured into the concentrated lime milk, and the mixture is repeatedly stirred with a stick.

3. Stone sulfur mixture composite liquid. Stone sulphur mixture stock solution 0.25 kg, salt 0.25 kg, lime 1.5 kg, oil amount, water 5 kg. First add the lime to the mature lime, pour the oil and stir constantly, add water to make the milk, then add the stone sulphur solution and brine.

4. Lime soy oil mixture. Take 6 kg of quicklime, 1 kg of salt, 0.75 kg of soybean oil and soybean milk. First, turn the quicklime into water, dissolve the salt with water, then pour the two into the same container, add the soybean oil and soy milk, and continue to add enough water to stir.

5. Slaked lime cement yellow mud coating agent: 1000 grams of slaked lime, 1000 grams of cement, 1250 grams of yellow mud. The slaked lime, cement and yellow mud are mixed with water and stirred into a slurry to be used. The insecticide and fungicide may be added as appropriate to treat the branches and diseases of the forest. Pay attention to the use.

Third, the fruit tree whitening agent should be used with the use, not long-term release. When using, the whitening agent should be thoroughly stirred to facilitate the brushing and the whitening agent is tightly adhered to the trunk. Before using the whitening agent, it is best to cut off the diseased branches, weak branches, aging branches and overly dense branches, then collect them for burning, and wrap the cracks and cracks in a plastic film. In the process of careful inspection, if the harmful insects in the branches are found to be infiltrated, the cotton pests should be used to kill the pests and then whitened. When brushing, use a brush or grass to pick up the white agent. Choose the sunny day to evenly coat the base and the main stem of the main branch. The white part is preferably 1 to 1.5 meters away from the ground.

The white reflective effect of lime not only reduces the absorption of solar thermal energy, but also reduces the temperature difference between day and night, protects the cortex, prevents sunburn and freezing damage, and prevents pests such as beetles, gems, and spider mites from drying on the branches. It is harmful to lay eggs. The whitening agent contains a large amount of bactericidal and insecticidal ingredients, and has a good effect on refusing the bark of the mouse and reducing the onset of the branches.

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