近年来,水稻纹枯病和菌核病在我县危害损失严重,发病面积和危害程度逐年增加,1963年至1970年每年发生面积在15—20万亩,损失面积5万亩左右,1971年至1975年发生面积45—58万亩,受害损失面积12—18万亩。历年发病株率是:1963年至1970年为14.1—65.3％,1971年至1975年上升到20—78.6％。据我所测定:早稻严重发病丘损 In recent years, rice sheath blight and sclerotinia in our county a serious loss of damage, the incidence of the area and the degree of harm increased year by year, from 1963 to 1970 an annual area of ​​15-20 mu, loss area of ​​about 50000 acres, 1971 To 1975 occurred an area of ​​45-58 acres, the victim area of ​​12-18 mu loss. The annual incidence of plant disease was: from 19.163 to 1970-1.45.3%, 1971-1975 to 20-78.6%. According to my test: a serious incidence of early rice hill damage