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水稻是鄂北地区主要的粮食作物之一。常年因病虫草为害损失稻谷约20—30％以上,严重障碍水稻高产,是急待解决的问题。 一、病虫草发生概况 1.病虫发生概况。1985年以来,病虫发生总的趋势是虫害重于病害。虫害不但种类多,而且发生的面积大,损失重。鄂北为害水稻较重的虫害主要有7种:三化螟、二化螟、稻纵卷叶螟、褐飞虱、白背飞虱、稻苞虫、稻蓟马;为害较重的病害主要有4种:纹枯病、白叶枯病、稻瘟病、稻曲病。从发生的面积看,据襄樊市植保站统计,全市年平均病虫发生面积891.3万亩,其中虫害发生面积666.43万亩,占74.77%,病害发
Rice is one of the major food crops in northern Hubei. Perennial damage due to disease caused by Cordyceps rice loss of about 20-30%, a serious obstacle to high yield of rice is an urgent problem to be solved. First, the occurrence of disease and insect pests 1 pest occurrence situation. Since 1985, the general trend of occurrence of pests is that pests are more serious than diseases. Not only many types of pests, and the occurrence of large area, heavy loss. There are mainly seven kinds of pests which damage rice in northern Hubei Province: Borer, Chilo suppressalis, Cnaphalocrocis medinalis, Nilaparvata lugens, Sogatella furcifera, rice insects and rice thrips; the most serious diseases are 4 Species: sheath blight, bacterial blight, rice blast, rice false smut. According to the plant protection station statistics of Xiangfan City, the annual average area of pests and diseases in the city is 8.913 million mu, of which 666.43 mu is pest occurrence area, accounting for 74.77%