我国褐飞虱生物型监测初报

 我国为褐飞虱迁入地带，田间褐飞虱种群是由具有不同致害性的生物型个体所组成的混合体。所以，一个田间种群的生物型属性即为该种群优势个体的致害性。根据我们自1981-1991年逐年系统监测结果，浙江省田间褐飞虱种群的致害性在年度间有波动，但自1989年开始其致害性已稳定地属生物2。浙江省褐飞虱由生物型1转变为生物型2的过程，落后于南方的海南和广西省（区），比热带虫源地更迟。

PRELIMINARY MONITORING THE BIOTYPES OF THE BROWN PLANTHOPPER NILAPARVATA LUGENS STAL IN CHINA

China belongs to the immigrated zone of the brown planthopper (BPH), Nilaparvata lugens Stal, the field populations consist of hetergenetic individuals with different virulences, i.e.different biotypes.According to the successive monitoring tests from 1981 to 1991, the virulences of the populations collected in Zhejiang province fluctuated among various years, but since 1989, the virulences have changed into those of biotype 2. The duration of BPH bjotype shift in Zhejiang province was longer than that in the southern provinces, and far longer than that in tropical souree countries.