吡虫啉防治水稻秧田蓟马的初步研究

Initial Study of Controlling Thrips in Rice Seedling Field by Imidacloprid

每１００公斤水稻干种拌７Ｏ％吡虫啉１００、２００、３００克三个处理对稻蓟马的防效分别是９８．１％、９７．６％、９８．６％，其持效期都在３０天以上，可使稻苗在整个秧田期免遭稻蓟马危害。每亩用４克吡虫啉喷雾，药后１、３、７天防效分别达９０．６％、８７．８％、８８．３％，且对水稻安全，可作为防治稻蓟马新药剂。

Imidacloprid,a new insecticide,was used to control thrips(Thrips oryzae Williams) in rice seedling field by seed dressing.At the dosage of 70,140 and 210 g a.i./100 kg rice seed,the control effect were 98.1%,97.6% and 98.6% respectively,and the action lasted 30 days.In the foliar application of imidacloprid at dosage of 60 g a.i./ha,the control effect was 90.6%(1 day after application),87.8%(3 days after application) and 88.3%(7 days after application).Imidacloprid is safe to rice seedling and can be used as a new tool to control thrips.