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以菜青虫、甜菜夜蛾、小菜蛾幼虫为防治对象,采用喷雾法,研究了4种生物源杀虫剂、2种化学杀虫剂的田间防治效果。结果表明,20%氯虫苯甲酰胺悬浮剂3 000倍液、15%茚虫威乳油2 900倍液、6%乙基多杀菌素悬浮剂1000倍液、5%桉油精可溶液剂400倍液处理的效果较好,药后1 d防效均达68%以上,药后7 d防效均达90%以上。上述处理可交替轮换使用,以防治北京花椰菜田的主要鳞翅目害虫。
In order to control the larvae of Pieris rapae, Spodoptera exigua and Plutella xylostella, the spraying methods were used to study the field control effects of four kinds of bio-insecticides and two kinds of chemical insecticides. The results showed that 20% chlorantranilon SC suspension 3000 times, 15% indoxacarb EC 2 900 times, 6% ethyl spinosyn 1000 times, 5% eucalyptol concentrate 400 The effect of timesolution treatment is better. The anti-efficacy effect reached 68% at 1 day after drug treatment, and the anti-efficacy reached more than 90% at 7 days after drug treatment. The above treatments can be used alternately to prevent and control major Lepidoptera pests in Beijing cauliflower fields.