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近年来,杭州市晚稻稻穗瘟流行十分严重,在全年病虫损失中居首位。1980年是近十年中发病最重的一年。 一、发病情况和特点 1980年晚稻穗瘟病情上升快,持续时间长,发病面广,危害严重。稻瘟在9月下旬始见,10月上旬盛发,持续到10月下旬,发病期长达30多天,比一般年份长10天左右。据肖山县宏伟公社春雷大队定点观察:9月25日始见穗瘟,30日穗发病率6％,10月3日猛增为40％,病情指数由5.2增为16,10月14日穗发病率达91.49％,病情指数68.5,25日病情指数高达82.8。
In recent years, Hangzhou rice panicle blast epidemic is very serious, pest losses in the first place. 1980 is the worst year in nearly a decade. First, the incidence and characteristics of rice blast in late 1980, the situation rose faster, longer duration, the incidence of a wide range of serious harm. Rice blast began to see in late September and flourished in early October and lasted until late October. The disease period was more than 30 days, about 10 days longer than the average year. According to Xiao Shan County grand commune spring thunder brigade designated observation: Sept. 25 saw blast head blast, 30% incidence of spike 30%, October 3 soared to 40%, the disease index increased from 5.2 to 16, October 14 Spike incidence of 91.49%, disease index 68.5, 25, the disease index as high as 82.8.