湖南省水稻二化螟防治药剂筛选

Screening of Insecticides for Chilo suppressalis in Hunan Province

为了筛选出适合湖南地区防治水稻二化螟的高效、绿色药剂,本研究选取7种防治药剂开展了田间防效评价。结果表明:施药后7、14 d,100亿孢子/mL金龟子绿僵菌油悬浮剂防治效果最佳,分别达到91.17%和96.10%;25%乙基多杀菌素水分散粒剂、200 g/L四唑虫酰胺悬浮剂、12%甲维·虫螨腈悬浮剂、20%阿维·三唑磷乳油及200 g/L氯虫苯甲酰胺悬浮剂+25%喹硫磷乳油在施药后7 d的防治效果分别为67.56%、58.88%、53.12%、53.95%和69.64%,在施药后14 d的防治效果分别为77.95%、84.61%、66.93%、75.91%和84.84%;添加助剂对各药剂的防控效果无显著影响。产量测定结果表明:与清水对照相比,保产效果最好的为100亿孢子/mL金龟子绿僵菌油悬浮剂处理,保产率达到81.27%;其次为200 g/L氯虫苯甲酰胺悬浮剂+25%喹硫磷乳油+助剂,保产率达到59.36%;200 g/L氯虫苯甲酰胺悬浮剂+25%喹硫磷乳油、25%乙基多杀菌素水分散粒剂和12%甲维·虫螨腈悬浮剂+助剂的保产效果也较好,保产率均在40%以上;添加助剂对药剂的保产率无显著影响。

In order to screen out the effective and green insecticides suitable for the control of Chilo suppressalis in Hunan Province,this study selected 7 insecticides to conduct the field efficacy evaluation experiments.The results showed that on the 7th day and 14th day after application,the control effect of 10 billion spores/mL Metarhizium anisopliae OF(treatment A)was the best,reaching 91.17%and 96.10%respectively.The control effects of 25%spinetoram WG(treatment F),200 g/L tetraniliprole SC(treatment E1),12%emamectin benzoate·chlorfenapyr SC(treatment B1),20%avermectin·triazophos EC(treatment C1)and 200 g/L chlorantraniliprole SC+25%quinalphos EC(treatment D1)were 67.56%,58.88%,53.12%,53.95%and 69.64%on the 7th day after application,and 77.95%,84.61%,66.93%,75.91%and 84.84%on the 14th day after application,respectively.Adding adjuvants had no significant effect on the control effect of insecticides.The yield measurement results showed that compared with the clean water control,treatment A had the best yield-increasing effect,followed by treatment D2(200 g/L chlorantraniliprole SC+25%quinalphos EC+adjuvant),and the yield-increasing rate reached 81.27%and 59.36%respectively.The yield-increasing effects of treatment D1,treatment F and treatment B2(12%emamectin benzoate·chlorfenapyr SC+adjuvant)were also good,with yield-increasing rates all above 40%.Adding adjuvants had no significant effect on the yield-increasing effect of insecticides.