摘要:
测定了10种杀虫剂对龙眼角颊木虱及其捕食性天敌瓢虫的毒力和选择性,结果表明,吡虫啉、噻虫嗪对龙眼角颊木虱与天敌瓢虫的选择性最高,对龟纹瓢虫选择指数分别为11.10、10.36,对四斑月瓢虫的选择指数分别为10.05、7.06;氟虫腈、阿维菌素对天敌瓢虫的选择性均较高;拟除虫菊酯类杀虫剂以高效氯氰菊酯对天敌瓢虫的选择性最高,对龟纹瓢虫和四斑月瓢虫的选择指数分别为1.83和1.43,三氟氯氰菊酯、溴氰菊酯对龙眼角颊木虱的毒力最高,但对天敌瓢虫的选择性较低;毒死蜱对2种天敌瓢虫的选择性最低,选择指数分别为0.42和0.34。
Abstract:
The toxicity and selectivity of various insecticides on Cornegenapsylla sinica Yang et Li and two predatory ladybirds were studied.The results showed that the selective toxicity of imidacloprid and thiamethoxam were highest among 10 tested insecticides.The selective toxicity ratio(STR on ladybird,LC50/pest LC50)of imidacloprid and thiamethoxam on Propylaea japonica were 11.10 and 10.36,respectively,and on Chilomenes quadriplagiata,10.05 and 7.06,respectively.The insecticides,fipronil and avermectin,displayed greater STRs than other insecticides,except imidacloprid and thiamethoxam,on predatory ladybirds.Among 5 pyrethroid insecticides,alphacypermethrin exhibited the highest selectivity on P.japonica and C.quadriplagiata with STRs of 1.83 and 1.43,respectively.Cyhalothrin and deltamethrin exerted the highest toxicity on C.sinica Yang et Li,but rendered lowest STRs on the predatory ladybirds.Chlorpyrifos showed the lowest selectivity on the predatory ladybirds,P.japonica and C.quadriplagiata,with STRs of 0.42 and 0.34,respectively.
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