不同类型药剂对B型烟粉虱的毒力作用评价

Toxicities of different pesticides to B biotype Bemisia tabaci

采用浸叶法,在室内测定了9种药剂对B型烟粉虱不同虫态的毒力大小,结果表明,9种药剂对烟粉虱成虫的毒力大小依次为:阿维菌素>啶虫脒>印楝素>苦内酯>吡虫啉>毒死蜱>功夫>鱼藤酮,噻嗪酮对成虫无毒杀作用;对烟粉虱低龄和高龄若虫的毒力大小依次为:阿维菌素>啶虫脒>苦内酯>印楝素>吡虫啉>鱼藤酮>噻嗪酮>功夫>毒死蜱和阿维菌素>苦内酯>啶虫脒>印楝素>吡虫啉>鱼藤酮>噻嗪酮>毒死蜱>功夫;9种药剂对烟粉虱卵都没有表现出明显的毒杀作用。此外,B型烟粉虱成虫接触经印楝素处理的甘蓝叶片后,在未经印楝素处理的叶片上产卵量显著下降,所产卵的孵化率显著降低。

The toxicities of nine insecticides to different development stages of B biotype Bemisia tabaci were evaluated using the leaf dip method under laboratory conditions. The results showed that the toxicity order of tested insecticides against the adult stage was as follows, abamectin 〉 acetamiprid 〉 azadirachtin 〉 oxymatrine 〉 imidacloprid 〉 chlorpyrifos 〉 cyhalothrin 〉 rotenone, buprofezin had no effect on adult. The toxicity orders of 9 pesticides to low instar and high instar nymphs of B. tabaci were abamectin 〉 acetamiprid 〉 oxymatrine 〉 azadirachtin 〉 imidacloprid 〉 rotenone 〉 buprofezin 〉 cyhalothrin 〉 chlorpyrifos, and abamectin 〉 oxymatrine 〉 acetamiprid 〉 azadirachtin 〉 imidacloprid 〉 rotenone 〉 buprofezin 〉 chlorpyrifos 〉 cyhalothrin, respectively. No toxicity to the pest eggs had been found in all tested insecticides. The adults of B biotype B. tabaci, which had exposed to azadirachtin-coated cabbage leaves for 2 days, laid significant fewer eggs than those that had not exposed to azadirachtin, and the eggs laid by the former gave significant lower hatching percentage than those laid by the latter.