4种药剂防治黄芪蚜虫田间药效试验

Efficiency Test of Four Agents against Astragalus membranaceus (Fisch.) Bge. Aphids

选用25%吡蚜酮悬浮剂1 250倍液、2.5%溴氰菊酯乳油3 000倍液、5%啶虫脒乳油4 000倍液、20%百虫净乳油800倍液对黄芪蚜虫进行了田间防效试验。结果表明,2.5%溴氰菊酯施药后1 d的防治效果达90%以上,具有速效性。药后7 d 25%吡蚜酮、20%百虫净处理的防治效果均在93%以上,具有持久性。4种药剂处理对黄芪茎粗影响不显著,但20%百虫净处理对黄芪株高影响显著(P<0.01)。25%吡蚜酮和20%百虫净对黄芪高效、安全,环境兼容性好,毒性较低,是防治黄芪蚜虫的理想药剂。

Four agents were selected to control the aphids on Astragalus membranaceus （ Fisch. ） Bunge. They were 1 250 times of 25% pymetrozine SC, 800 times of 20% Baichongjing EC, 3 000 times of 2.5% deltamethrin EC and 4 000 times of 5% acetamiprid EC. The field trial results showed that 2.5% deltamethrin EC was quick -acting with the control effect more than 90% after one day, while 25% pymetrozine SC and 20% Baichongjing EC had long efficiency with the control effect more than 93% after applied for 7 days. The four agents had no significant effect on the stem diameter of Astragalus membranaceus, but 20% Baichongjing EC had very significant effect on its plant height. In a word, 25% pymetrozine SC and 20% Baichongjing EC were safe and high efficiency to Astragalus membranaceus, and had low toxicity and better environmental compatibility, so they were optimal for controlling Astragalus membranaceus aphids.