Answer: The application of apple in young fruit should not stimulate the young leaves, fruit surface and affect the division of fruit cells. The fruit surface in the young fruit period is very young and sensitive to drug reactions. If the farmer chooses to use metal pesticides such as sulfur, arsenic, iron and copper, organophosphorus insecticides and strong penetrating pesticides at this stage, Easily stimulate the fruit surface, forming fruit rust. The use of some systemic compounds, such as azole pesticides, may affect young fruit cell division, resulting in "stuck" phenomenon, and may lead to young fruit perforation prominent, so that young fruit lenticels into small black spots.
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