6种药剂对重阳木帆锦斑蛾的毒力测定和药效试验

Toxicity test and control efficacy of six insecticides against Histia rhodope

重阳木帆锦斑蛾Histia rhodope是重阳木Bischofia polycarpa上的主要害虫。选用6种药剂对重阳木帆锦斑蛾进行室内毒力测定和室外药效试验。采用浸渍法的室内毒力测定结果表明:24 h后杀虫活性最高的是甲维盐(LC50为0.312 0 mg/L),烟碱.苦参碱和高效氯氰菊酯次之(LC50值分别为3.548 5和8.920 8 mg/L),毒死蜱、灭幼脲Ⅲ号稍差(LC50分别为128.844 2和176.349 9 mg/L),Bt活性最差(LC50为3 490 831.511 2 mg/L)。48 h后,药剂活性呈上升趋势,活性最高的仍为甲维盐。室外药效试验结果显示甲维盐、毒死蜱、高效氯氰菊酯1 000倍液,烟碱.苦参碱800倍液对重阳木帆锦斑蛾的防治效果较好。

Histia rhodope was a major pest in Bischofia polycarpa. The result of toxicity test with immersion method in lab showed emamectin benzoate presented the best insecticidal activity against the third instar larvae of H. rhodope 24 h after the treatments with an LCs0 value of 0. 312 0mg/L, followed by that of matrine-nicotine, beta-cypermethrin, chlorpyrifos and chlorbenzuron 111 with LCs0 values of 3. 548 5,8. 920 8,128. 844 2,176. 349 9 mg/L respectively. That of Bt showed the lowest activity. The toxicity of the 6 insecticides 48 h after the treatment increased. The result of control efficacy test in the field showed that emamectin benzoate, chlorpyrifos, beta-cypermethrin diluted into 1 000 times and malxine-nicotine diluted into 800 times showed good control efficacy.