After apple blossoming, before the bag is wrapped, if the drug is improperly selected, improperly mixed, and improperly sprayed, it will stimulate the pores of the young fruit to form hidden black spots, cracks, chicken claw lines, fruit spots 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 a coarse particle size and a low suspension rate. 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 rust, fruit burst and other phytotoxicity.
Penetrants and synergists cannot be used. To prevent irritation of young fruit.
It is not advisable to use the spray head to directly slash the fruit surface. The nozzle should not be too close to the fruit surface and the residence time should be short.
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