论文部分内容阅读
近年来,稻纵卷叶螟Cnaphalocrocis medinalis Guenee每年都有一或几代较大量发生,使部分社队频繁地施用化学农药。为进一步查明稻纵卷叶螟寄生性天敌的作用,改进化学防治技术,为协调防治提供依据,我们于1975～1980年对稻纵卷叶螟卵、幼虫和蛹各虫态寄生性天敌作了调查。1979年在全县山区、半山区、丘陵和平原设点9个采集饲养。调查区属稻纵卷叶螟发生的江南区岭北亚区,年发生五代,迟发年五代不完整;第一代虫源和第二代的主要虫源为外地迁入,第一代发生量极少。调查从第一代幼虫期开始,至第四或第五代蛹期结束。现将调查的部分结果作一报导,以供参考。
In recent years, Cnaphalocrocis medinalis Guenee has been found in large quantities in one or several generations each year, causing some communes and communes to frequently use chemical pesticides. In order to further identify the role of the parasitic natural enemies of rice leaf roller, improved chemical control technology, to provide a basis for coordinated control, we in 1975 ~ 1980 on rice leaf roller, larvae and pupae parasitic natural enemies The investigation. In 1979 in the county mountain, Mid-levels, hills and plains nine collection and rearing. The investigation area belongs to the Lingbei subregion of Jiangnan District where the rice leafroller occurs. Five generations occur each year, and the late generation is not complete in the fifth generation. The main source of the first generation and the second generation migrate into the area and the first generation occurs Very small amount. The investigation started from the first larval stage and ended with the fourth or fifth generation pupal stage. Part of the survey results will now be reported for reference.