春夏季节十字花科蔬菜上害虫危害十分严重,主要有菜青虫、小菜蛾等,田间发生量很大,加之世代交替,给防治工作带来了很大的难度。为此,我们对自行研制开发的0.3%老·甲维盐微乳剂在去年试验有效的基础上,2006年对菜青虫、小菜蛾等害虫进行了田间小区药效试验研究,取得了较好的效果。现将试验结果总结如下。1材料与方法1.1供试药剂0.3%老·甲维盐微乳剂,《植物源农药的研究与开发》项目组研制开发；4.5%高效氯氰菊酯微乳剂 Spring and summer cruciferous vegetables on the pest damage is very serious, mainly cabbage caterpillars, diamondback moth and so on, a large amount of field occurred, combined with the generation of alternating, to prevention and control work has brought great difficulty. Therefore, on the basis of last year’s experiment that the 0.3% La-Dimethoate microemulsion developed by ourselves was effective, we conducted field trial on pests of Pieris rapae and Plutella xylostella in 2006 and achieved good results effect. The test results are summarized below. 1 Materials and methods 1.1 for the test agent 0.3% of the old A-dimensional salt microemulsion, “research and development of plant-derived pesticides” project team research and development; 4.5% beta-cypermethrin microemulsion