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稻粒黑粉病主要侵染时期在水稻齐穗至灌浆初期；公顷用１８．７％的灭黑灵４５０ｇ防效最高，保产率可达１８．１２％。
The main infection period of rice powdery mildew was in the period from the heading of rice to the early filling of grain; the hemorrhagic rate of 18.7%