5种杀虫剂对B型烟粉虱的毒力测定

采用浸叶法分别测定了苦参碱、阿维菌素、氯氰菊酯、灭多威和吡虫啉对B型烟粉虱不同虫态的毒力.结果表明:苦参碱对烟粉虱卵的毒力最高,LC50为0.802 mg.L-1,其毒力是吡虫啉的323.8倍;阿维菌素、苦参碱和吡虫啉对1龄和3龄若虫的毒力均较高,但对1龄若虫的毒力高于3龄若虫;阿维菌素和苦参碱对成虫的毒力较高,分别是吡虫啉的111.6和77.4倍;而灭多威和氯氰菊酯对烟粉虱各虫态均表现出较低的毒力.

Toxicities of five insecticides to Bemisia tabaci B-biotype

Toxicities of matrine,abamectin,cypermethrin,methomyl and imidacloprid to different development stages of Bemisia tabaci B-biotype were determined using leaf-dipping method.The results showed that matrine had the highest toxicity to eggs of B.tabaci,the LC50 value was 0.802 mg·L-1,which was 323.8 times as high as imidacloprid;abamectin,matrine and imidacloprid showed high toxicities to 1st and 3rd instar nymphs,and the toxicity to 1st instar nymphs was higher than to 3rd instar nymphs;abamectin and matrine had high toxicities to adults,which were 111.6 and 77.4 times as high as imidacloprid respectively;methomyl and cypermethrin had lower toxicities to all development stages of whiteflies.