4种药剂防治黄芪蚜虫田间药效试验

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1d的防治效果达90％以上,具有速效性.药后7 d25％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.

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

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.