稻纵卷叶螟Cnaphalocrocis medinalis Guenee是我省水稻的主要害虫。每年发生五代,常年第二代幼虫于七月上中旬在早稻穗期、第三代于八月上中旬在中稻圆杆至拨节期与双晚分蘖期、第四代于九月上旬在双晚孕穗抽穗期造成为害,鄂东同双季稻区还有第五代发生。目前药剂防治是控制稻纵卷螟的一个有效措施,为了减少稻田中的农药用量,减少环境污染和降低农业生产成本,保护农业生态环境,自1981～1982年在我省江陵县纪南区混栽稻区,选在控制用药的稻田,结合稻纵卷叶螟生命表的研究,对自然天敌种类(主要对寄生性天敌)及其控制作用进行了初步观察,其观察的方法是: 1.将稻纵卷叶螟各世代划分为卵期、1～2龄、3～4龄、5龄幼虫期、蛹期及成虫期六个年龄阶段,用人工接虫、卵与在大田直接采虫、卵的方法观察各阶段的寄生 Cnaphalocrocis medinalis Guenee is the main pest of rice in our province. Five generations occur each year, perennial second-generation larvae in mid-July in early rice heading stage, the third generation in mid-August in mid-rice rounding to dialing and double tillering stage, the fourth generation in early September in double Earburn at late pregnancy cause damage, with the second crop of Hubei Province there is the fifth generation occurred. At present, the control of pesticides is an effective measure to control the rice leafroller. In order to reduce the amount of pesticides used in rice fields, reduce the environmental pollution and reduce the agricultural production cost and protect the agricultural ecological environment, from 1981 to 1982, In the rice-planting area, the natural enemy species (mainly the parasitic natural enemies) and their control effects were preliminarily observed in combination with the life table of the rice leaf roller, and the control methods were as follows: 1. The successive generations of C. medinalis were divided into four stages: egg stage, 1 ~ 2 year old, 3 ~ 4 year old, 5th instar larvae stage, pupal stage and adult stage. , Egg method to observe the various stages of parasitism