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小菜蛾是小白菜、大白菜、甘蓝、花菜等十字花科常见的抗性害虫之一,发生世代多,危害时间长,致使这类蔬菜产量、质量受到很大影响。一、细菌杀虫剂对小菜蛾等鳞翅目类的害虫,使用细菌性杀虫剂,防效很好。如 Bt(苏云金杆菌),这类杀虫剂的机理是麻痹小菜蛾幼虫的神经,破坏肠道消化功能致死,每亩用药50～100克兑水50公斤喷雾;又如3.2%敌宝可湿性粉剂、50%都来顺可湿性粉剂、7.5%康多惠悬浮剂等。在施用细菌性杀虫剂时要注意几点:一是施用剂量不宜过高或过低;二是要重点防治低龄幼
Plutella xylostella is one of the common resistant pests of Brassicaceae, such as Chinese cabbage, Chinese cabbage, cabbage, cauliflower and so on. It takes more than one generation to cause a long time for harm and the yield and quality of such vegetables are greatly affected. First, the bacterial pesticides on diamondback moth and other Lepidoptera pests, the use of bacterial pesticides, good control effect. Such as Bt (Bacillus thuringiensis), the mechanism of such insecticides is to paralyze the nerve of Plutella xylostella larvae, destruction of intestinal digestive function lethal, 50 to 100 grams per acre watered 50 kg spray; Another example is the 3.2% Powder, 50% all come Shun WP, 7.5% Condor suspension and so on. In the application of bacterial pesticides should pay attention to several points: First, the dose should not be too high or too low; the second is to focus on prevention and treatment of young and old