9种杀虫剂对桧柏臀纹粉蚧的室内毒力及田间防效

Indoor toxicity and field control efficacy of nine insecticides to Planococcus vovae(Nassonov)

桧柏臀纹粉蚧Planococcus vovae是近年来发生的重要外来入侵昆虫。为明确生产中常用的9种杀虫剂对桧柏臀纹粉蚧的防治效果,开展其室内毒力和田间防效试验。室内毒力测定采用浸渍法,田间防效试验采用喷雾法。室内毒力测定结果表明:对桧柏臀纹粉蚧2龄若虫毒力最高的是双丙环虫酯,LC_(50)为2.59 mg/L;其次为呋虫胺和吡虫啉,LC_(50)分别为6.94 mg/L和7.02 mg/L。田间防效试验结果表明:50 g/L双丙环虫酯可分散液剂5000倍液、70%噻虫嗪水分散粒剂10000倍液和50%呋虫胺可湿性粉剂5000倍液在施药后15 d对桧柏臀纹粉蚧的防效高达90.32%~94.06%。综合分析室内毒力测定和田间防效结果,筛选出可用于防治桧柏臀纹粉蚧的最适药剂为50 g/L双丙环虫酯可分散液剂、70%噻虫嗪水分散粒剂、350 g/L吡虫啉悬浮剂和50%呋虫胺可湿性粉剂。

Planococcus vovae(Nassonov)is one of important alien invasive insect pest in China in recent years.This study aims to assess the toxicity of nine insecticides to P.vovae by indoor bioassay and field experiment to screen out the effective pesticides.The dipping method was adopted for the indoor toxicity bioassay,and the foliar spray method for field efficacy trials.The toxicity test showed that afidopyropen(LC_(50)=2.59 mg/L)had the highest toxicity to the 2nd instar nymphs of P.vovae,followed by dinotefuran(LC_(50)=6.94 mg/L)and imidacloprid(LC_(50)=7.02 mg/L).Field efficacy trials indicated that afidopyropen 50 g/L dispersible liquid 5000 fold solution,thiamethoxam 70%water-dispersible granule 10000 fold solution and dinotefuran 50%wettable powder 5000 fold solution reached to 90.32%-94.06%of control efficacy at 15 d after the insecticide spray.The most suitable insecticides for control of P.vovae are afidopyropen 50 g/L dispersible liquid,thiamethoxam 70%water-dispersible granules,350 g/L imidacloprid suspension and 50%dinotefuran wettable powder.