A: For the Red Fuji varieties, the period of invasion of Mycoplasma gondii is only from the flowering period to the young fruit formation period, and the invasive way can only be through the wilting stigma. Therefore, red Fuji apples only in the flowering period of frost damage or cold rain in the year, mold heart disease is likely to occur. In this regard, fruit growers can spray polyoxin, polyoxorubicin, or mesenterin at the apple flowering stage.
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