不同药剂防治玉米蚜室内毒力及田间药效试验

Toxicity Test and Field Control Effect of Different Pesticides Against on Rhopalosiphum maidis(Fitch)

为筛选防治玉米蚜虫的有效药剂,采用室内毒力测定与田间药效试验相结合的方法,研究了双丙环虫酯等复配剂对玉米蚜的防效。结果表明:双丙环虫酯与吡蚜酮质量比1∶5时,共毒系数极值为172.20,有效成分用量为(10+50)g·hm-2对玉米蚜田间防效达86.59%;双丙环虫酯与吡虫啉质量比1∶1时,共毒系数极值为183.80,有效成分用量为(15+15)g·hm-2对玉米蚜的田间防效达93.74%。丙环虫酯与噻虫啉质量比1∶5时,共毒系数极值为196.12,有效成分用量为(10+50)g·hm-2对玉米蚜的田间防效达89.19%。双丙环虫酯与吡蚜酮、吡虫啉、噻虫啉复配防治玉米蚜具有增效作用,可有效地控制该虫的发生。

In order to select effective chemicals to control Rhopalosiphum maidis(Fitch),the field trials and laboratory experiments were conducted to test the toxicity,the control effect of afidopyropen on corn aphid was studied.The results showed that the optimum control effect,extreme value of co-toxicity coefficient and active component content as follows:86.59%,172.20,(10+50)g·hm-2 when the mass ratio of afidopyropen and pymetrozine was 1∶5.For the mass ratio of afidopyropen and imidacloprid achieved 1∶1,the optimum control effect,extreme value of co-toxicity coefficient and active component content were 93.74%,183.80,(15+15)g·hm-2.For the mass ratio of afidopyropen and thiacloprid achieved 1∶5,the optimum control effect,extreme value of co-toxicity coefficient and active component content were 89.19%,196.12,(10+50)g·hm-2.The minture of afidopyropen and pymetrozine,imidacloprid and thiacloprid could produced a synergism to control the Rhopalosiphum maidis(Fitch).