我县是以单季中籼稻为主的地区,单季中籼稻面积占水稻总面积的85%以上。在一季稻生育中后期,白背飞虱、褐稻虱和稻纵卷叶螟常混合发生,以往常应用甲胺磷、叶蝉散等速效杀虫剂防治稻飞虱,但因这些杀虫剂残效期短,对天敌杀伤率大,特别是甲胺磷防治后常引起稻飞虱的再度猖獗。为 My county is based on a single season indica rice-based areas, single-season indica rice area accounts for more than 85% of the total area of ​​rice. In the mid-to-late season of one-cropping, whitebacked planthopper, brown planthopper and rice leaf roller are often mixed. Fast-acting insecticides such as methamidophos and leafhoppers are often used to control planthoppers. However, Agent short residual period, killing rate of large natural enemies, especially methamidophos often caused by the recurrence of planthoppers rampant. for