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为了降低蔬菜上农药残留量,选择一个杀虫谱较广、防治效果好的杀虫剂。1985～1986年对近年来常用的杀虫剂进行比较试验,结果报道于后。 一、材料与方法 试验药剂B.t乳剂(为复方,内含0.1％氯氰菊酯,湖北省农科院微生物工厂提供),含120亿活孢子/毫升;2.5％溴氰菊酯(进口)。两种药剂试验浓度分别为500和5000倍液。 室内试验 (1)从田间甘蓝、大白菜上采回不同龄期的菜青虫(Pieris rapae)、斜
In order to reduce the amount of pesticide residues on vegetables, choose a pesticide that has a wide insecticidal spectrum and good control effect. From 1985 to 1986, the commonly used pesticides in recent years were compared and the results were reported later. I. Materials and methods Test agent B.t. Emulsion (for compound, containing 0.1% cypermethrin, provided by Hubei Academy of Agricultural Sciences, Microbiological Factory) contains 12 Billion live spores / ml; 2.5% Deltamethrin (imported). The two agents test concentrations were 500 and 5000 times the liquid. Laboratory tests (1) Pieris rapae collected from field cabbage and Chinese cabbage at different instars,