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水稻病虫害 预计2003年稻瘟病发生面积接近常年。其中西南稻区发生程度4级(1级:轻发生,2级:偏轻发生,3级:中等发生,4级:偏重发生,5级:大发生),华南、东南沿海和东北稻区3级,局部区域将严重发生。纹枯病华南稻区发生程度4级,其
Rice pests and diseases It is estimated that the occurrence area of rice blast in 2003 is close to perennial. Among them, the occurrence of southwest rice area is 4 grades (Grade 1: light occurs, Grade 2: partial light occurs, Grade 3: moderate occurs, Grade 4: emphasis occurs, Grade 5: great occurs), south China, southeast coast and northeast rice Level, the local area will be serious. The incidence of sheath blight in southern China rice 4, its