0.5%苦参碱生物杀虫剂防治核桃星尺蛾试验

Evaluation of 0.5%Matrine Biological Insecticides against Ophthalmodes albosignaria

在核桃星尺蛾(Ophthalmodes albosignaria)发生与危害较严重的陇南市康县进行了不同浓度0.5%苦参碱生物杀虫剂防治幼虫效果和2000倍液0.5%苦参碱杀虫剂杀虫持效期试验,结果为1000、2000、3000、4000倍液浓度防治后降幼虫死亡率为59.68%~91.20%,校正死亡率58.92%~91.02%,与对照(喷清水)相比各浓度都有显著灭杀效果,且随浓度下降幼虫死亡率降低;施药后随着时间的延长,2000倍液0.5%苦参碱防治效果逐渐降低,至17 d时防治效果下降到50%以下,建议在当地应用0.5%苦参碱生物杀虫剂防治核桃星尺蛾,浓度选择2000倍液。

Ophthalmodes albosignaria(Bremer et Grey)is one of the main pests attacking Longnan walnut.The experinment to determine the efficacy and duration of different concentrations of 0.5%matrine biological insecticide against larvae was conducted.The result showed that 0.5%matrine biological insecticide 1000,2000,3000 and 4000 times liquid had significant insecticidal effect ranging from 59.68%to 91.20%and calibrated effect ranging from 58.92%to 91.02%.With the extension of time,0.5%matrine biological insecticide 1000 and 2000 times liquid had declining insecticidal effect and the control effect of 2000 times liquid 0.5%matrine decreased to below 50%at 17 days.0.5%matrine biological insecticide at 2000 times is safe against natural enemies.