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测定了吡虫啉、鱼藤酮、阿维菌素和印楝素 4种杀虫剂对桃蚜及其捕食性天敌异色瓢虫成虫的相对毒力。 4种药剂对桃蚜的毒力大小依次为阿维菌素 >吡虫啉 >鱼藤酮 >印楝素 ,其 L C50 分别为 0 .0 4 2、1.96、6 .5 4和 10 .17mg/ L。对异色瓢虫的 L C50 则分别为 10 0 9.4 2、2 0 1.89、82 0 2 .90和大于 75 0 0 mg/ L,益害毒性比分别为 2 4 0 33.81、10 3.0 1、12 5 4.2 7和大于 786 .6 3。4种药剂在有效防治桃蚜的前提下对天敌异色瓢虫的安全性依次为阿维菌素 >鱼藤酮 >印楝素 >吡虫啉。阿维菌素、吡虫啉、印楝素和鱼藤酮这 4种药剂均可在蚜虫综合治理中发挥有效的作用
The relative virulence of imidacloprid, rotenone, avermectin and azadirachtin against Myzus persicae and their predatory enemies Coccinella septempunctata were determined. The toxicities of the four agents to Myzus persicae were avermectin> imidacloprid> rotenone> azadirachtin, with L C50 values of 0.042, 1.96, 6.54 and 10.17 mg / L, respectively. The L C50 of the ladybird was 10 0 9.4 2,2 0 1.89,82 0 2 .90 and more than 75 0 0 mg / L, respectively, and the toxicity-induced toxicity ratios were 240 4 33.81,10 3.0 1,12 5 4.2 7 and greater than 786.6 The safety of 3.4 kinds of pesticides on the heterophorous ladybugs of natural enemies under the premise of effective control of Myzus persicae were avermectin> rotenone> azadirachtin> imidacloprid. Abamectin, Imidacloprid, Azadirachtin and Rotenone all play an effective role in the comprehensive management of aphids