2种药剂防治水稻中后期褐飞虱的效果研究

目的]了解50％呋虫胺水分散粒剂、60％吡蚜酮·噻嗪酮可湿性粉剂防治水稻褐飞虱的效果,确定其最佳使用剂量.方法]通过田间小区药效试验研究了50％呋虫胺水分散粒剂、60％吡蚜酮·噻嗪酮可湿性粉剂对水稻中后期褐飞虱的防治效果、持效时间和最佳使用剂量.结果]在褐飞虱卵孵化高峰期使用50％呋虫胺水分散粒剂180 g/hm2或者60％吡蚜酮·噻嗪酮可湿性粉剂600 g,/hm2,药后23 d防效可达90％以上,且对作物安全,对天敌影响较小.结论]该2种供试药剂在水稻中后期防治3代褐飞虱有较好的持效性,可望进一步研究开发.

Control Effects of Two Reagents against Brown Plant Hopper during Middle and Late Period of Rice

Objective] Control effects of 50％ Dinotefuran Water Dispersible Granule and 60％ Pymetrozine · Buprofezin wettable powder against brown plant hopper to find out the best dose.Method] Control effects,efficiency time and the best dose of 50％ Dinotefuran Water Dispersible Granule and 60％ Pymetrozine · Buprofezin wettable powder against brown plant hopper during middle and late period of rice were studied through plot test.Result] After 50％ Dinotefuran Water Dispersible Granule at 180 g/hm2 or 60％ Pymetrozine · Buprofezin wettable powder at 600 g/hm2 was used to control brown plant hopper at the egg hatching peak,the control effects reached above 90％ in 23 days,furthermore they were safe to rice and natural enemy.Conclusion] The two reagents have good effects to control brown plant hopper during middle and late period of rice,so they could be used to further apply.