A: The fruit grower should be careful not to stimulate the young leaves, fruit surface and affect the splitting of the fruit cells in the apple young fruit spraying period. The fruit surface in the young fruit period is very young and sensitive to drug reactions. If farmers choose to use metal pesticides such as sulfur, arsenic, iron, and copper, organophosphorus pesticides, 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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