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据四年来我县5个乡的调查,霜霉病主要发生于籼稻,尤以杂交稻为重.1980年洛阳乡徐家头队50亩杂交稻,因秧苗带病移栽,大田块块有病,20多亩重病田平均穴发病23%,每亩减产150～200斤,损失达15.6～20.8%.1982年安家乡前孙队2.4亩杂交稻制种秧田株发病率高达44.8%,终因病苗太多不能移栽.1983年有些地方也相当严重,秧田病株率达15～30%,既造成缺秧,又贻误季节.因此,对水稻霜霉病的发生和防治要认真加以研究.
According to the survey of 5 counties in our county in four years, downy mildew mainly occurs in indica rice, especially in hybrid rice. In 1980, 50 mu of hybrid rice of Xujiadou team in Luoyang, Disease, 20 acres of serious disease 23% average acreage, cut 150 to 200 pounds per acre, the loss of 15.6 ~ 20. 8% .1982 Anqian former Sun team 2.4 acres of hybrid rice seedling incidence of up to 44.8% Due to too many seedlings can not be transplanted in 1983 some places are quite serious, seedling disease rate of 15 to 30%, both caused by lack of seedlings, but also delaying the season Therefore, the occurrence and prevention of rice downy mildew should be carefully the study.