博落回杀虫作用的研究

目的]开发一种新型的植物源杀虫剂。方法]采用浸叶法和混药法,分别就博落回根乙醇提取物对菜粉蝶、亚洲玉米螟和桃蚜的生物活性进行了测定。结果]用1.0%的博落回根乙醇提取物处理菜粉蝶5龄幼虫后,24和48h的非选择性拒食率分别为91.78%和89.33%,7d后幼虫(或蛹)的校正累计死亡率为93.26%;用1.0%的博落回根乙醇提取物处理亚洲玉米螟3龄幼虫后,其体重逐日减少,5和10d的体重分别为对照体重的43.48%和24.59%,10d后的校正死亡率为78.57%;用1.0%的博落回根乙醇提取物处理桃蚜若虫后,12、24和48h的校正死亡率分别为59.33%、70.01%和83.24%。结论]博落回植物根乙醇提取物对菜粉蝶5龄幼虫、亚洲玉米螟3龄幼虫和桃蚜若虫具有很强的生物活性。

Study on the Insecticidal Action of Macleaya cordata

Objective] The aim of the research was to develop a new kind of botanical insecticide.Method] Using leaf-dipping method and mixture pesticide method,the biological activities of ethanol extract from the root of Macleya cordata to Pieris rapae L.,Ostrinia furnacalis and Myzus persicae Sulzer were determined resp.Result] The 5th -instar larva of P.rapae was treated with 1.0% ethanol extract from the root of M.cordata,the no-choice antifeedant rate after 24 and 48 h were 91.78% and 89.33% resp.and the adjusted accumulative mortality rate of larvae or pupa after 7 d was 93.26%.After the 3rd-instar larva of O.furnacalis was treated with 1.0% ethanol extract from the root of M.cordata,its body weight was decreased day by day,the body weight after 5 and 10 d were 43.48% and 24.59% of the control weight and the adjusted mortality rate was 78.57%.After the nymphae of M.persicae was treated with 1.0% ethanol extract from the root of M.cordata,the adjusted mortality rate after 12,24 and 48 h were 59.33%,70.01% and 83.24%.Conclusion] The ethanol extract from the root of M.cordata had stronger biological activities to the 5th-larva of P.rapae,the 3rd-larva of O.furnacalis and the nymphae of M.persicae.