保护地常用杀虫剂对巴氏钝绥螨的安全性评价

为探索与生物防治相协调的化学防治措施,测定了Bt、阿维菌素、吡虫啉、氟啶脲、溴氰菊酯和毒死蜱等6种保护地蔬菜常用杀虫剂对捕食性天敌巴氏钝绥螨的室内毒力,并初步评价了这6种杀虫剂对巴氏钝绥螨的安全性。结果表明,供试的6种杀虫剂对巴氏钝绥螨的毒力大小顺序依次为溴氰菊酯毒死蜱氟啶脲阿维菌素吡虫啉Bt;其中,溴氰菊酯对巴氏钝绥螨毒性最大,其LC50达77.04 mg.L-1,而Bt制剂的LC50为17 214.19mg.L-1,对巴氏钝绥螨的安全性相对较高。该试验结果对大田捕食螨释放及选择合理的化学制剂与之配合均有重要的理论和实践意义。

Safety evaluation of insecticides on Amblyseius barkeri (Phytoseiidae)

In order to explore chemical controls coordinated with biological controls,indoor toxicity test was conducted with Bacillus thuringiensis(Bt),abamectin,imidacloprid,chlorfluazuron,deltamethrin and chlorpyrifos to Amblyseius barkeri,an important predatory natural enemy.The results showed that the overall toxicity order of several insecticides to Amblyseius barkeri was deltamethrin>chlorpyrifos>chlorfluazuron>abamectin> imidaclo-prid>Bt.The deltamethrin had strong toxicity to Amblyseius barkeri and its LC50 was only 77.04 mg?L-1;while LC50 of Bt reached 17 214.19 mg?L-1.Compared with other insecticides,Bt was safer with releasing Amblyseius barkeri in field based on a high safety coefficient of 8.61.The results have important theoretical and practical sig-nificance not only in releasing predatory mites but also in choosing suitable chemical insecticides in field.