Apples fail to harvest fruit within the harvest period and are associated with reduced auxin levels in the plants. Spraying auxin can prevent apple fruit drop before harvest. Early maturing species, such as floribal skin, Fuhong, Fujin, etc., can be sprayed once with 40-50 mg/L naphthaleneacetic acid or sodium naphthalate solution two weeks before harvest. Marshal and other varieties, with 20 ~ 40 mg / l of sodium naphthyl acetate solution, sprayed for the first time in 1 month before the harvest, spraying again every other half. Spraying 2000 mg/L B9 solution two months prior to harvesting and spraying once a month, not only preventing pre-harvest fruit drop, but also improving apple quality and extending storage time.
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