To seek for the effective pesticides controlling Leptocybe invasa,we select seven commonly used pesticides and three kinds of mixture to do field efficacy test,the results showed that 10 groups of selected pesticides had control effect of different degrees on L. invasa. Except chlorpyrifos,the number of galls at 30 d after applying pesticide and the number of emergence holes at 40 d after applying pesticide in other pesticide treatments showed significant difference from the blank control. On the basis of galls and emer-gence holes decrease rates as indexes,16% Chongxianqing EC was an ideal pesticide for controlling L. in-vasa. The galls decrease rate was 83. 37% at 30 d after applying pesticide,and the emergence holes de-crease rate was 83. 57% at 40 d after applying pesticide. And if it is mixed with 2. 5% efficient cyhalo-thrin EC,the control effect will be more pronounced. This shows that mixed using of different mechanisms of insecticides has obvious synergism.%为寻求防治桉树枝瘿姬小蜂的有效药剂,有针对性地选取了7种常用药剂和3种混配剂进行林间药效试验。结果表明,所选的10组药剂对桉树枝瘿姬小蜂成虫、幼虫和蛹均具有不同程度的控制作用,除毒死蜱外,其他药剂处理后虫瘿数(药后30 d)和羽化孔数(药后40 d)均与清水对照差异显著。依据虫瘿减退率和羽化孔减退率指标,16%虫线清乳油是防治桉树枝瘿姬小蜂的理想药剂,药后30 d 的虫瘿减退率和药后40 d 的羽化孔减退率分别为83.37%和83.57%,其如果能与2.5%高效氯氟氰菊酯乳油混配使用,防治效果会更显著,说明不同作用机制的杀虫剂混合使用具有明显的增效作用。
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