After the apple blossoms and before bagging, the young fruit has just shed its hairs, and the lenticels are open and have not healed. The exposed young fruit is very sensitive to external factors. Improper selection of medicines, improper mixing, and improper spraying methods will stimulate the skin holes of the young fruit to form small black spots, cracks, chicken feet, fruit rust, fruit spot enlargement, fruit spot burst and other hidden phytotoxicity. In order to prevent these phytotoxicity, the following points should be paid attention to when spraying before bagging:
1. It is not advisable to use medicaments with coarse particles and poor suspension rate before bagging. Such as sulfur preparations and sulfur-containing compounding agents: chlorothalonil, ethyl phosphoric aluminum. Some domestic mancozeb and compound products. It has a strong stimulating effect on young fruits and is easy to cause hidden phytotoxicity.
2. It is not advisable to use compound fungicides, and it is recommended to use single-agent fungicides (single component). The compound fungicides produced by many manufacturers contain additives of unknown ingredients. It is recommended to buy a single dose, and mix it by yourself when spraying.
3. Inferior emulsifiable concentrates should not be sprayed. Advocate the use of powder, water or water dispersible insecticides, acaricides and fungicides.
4. Copper preparations should not be used. Use Bordeaux mixture and other copper preparations. In case of rain or wet weather, fruit rust, fruit spot enlargement, fruit spot burst and other drug damage are prone to appear on the fruit surface.
5. Penetrants and synergists cannot be used to prevent irritation of the young fruit surface.
6. When spraying, the droplets should be fine, the nozzle should not be too close to the fruit surface, and the residence time should be short. It is not suitable to use the nozzle to directly sprint the fruit surface of the young fruit.
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