After the apples thanked the flowers and before the bagging, the young fruit just took off the hair, the skin hole was not open yet, and the naked young fruit was extremely sensitive to external factors. If the drug is improperly selected, improperly mixed, and improperly sprayed, it will stimulate the young skin pores and form hidden black spots, cracks, chicken claw lines, fruit rust, fruit enlargement, fruit spot burst and other hidden phytotoxicity. In order to prevent these phytotoxicity, pay attention to the following points before spraying:
It is not advisable to use a drug with coarse particles and poor suspension rate before bagging. Such as sulfur preparations and sulfur-containing compounding agents, chlorothalonil, ethylphosphorus aluminum; some domestic mancozeb and compound products. These products have a strong stimulating effect on young fruit and are likely to cause hidden phytotoxicity.
It is not advisable to use a compound fungicide and to promote the use of a single dose of fungicide. Many manufacturers of compound fungicides contain unknown ingredients. It is recommended to buy a single dose and mix it yourself when spraying.
It is not advisable to spray a poor quality emulsifiable concentrate. The use of powders, liquids or water-dispersible insecticides, acaricides and fungicides is advocated.
It is not advisable to use copper preparations. Use copper preparations such as Bordeaux liquid. If it is exposed to rain or wet weather, the fruit surface is prone to fruit rust, fruit enlargement, fruit break and other phytotoxicity.
Penetrants and synergists should not be used to prevent irritation of young fruit.
Nearly, the stay time is short.
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