几种Bt复配杀虫剂对甘蓝小菜蛾的防治效果

Control effects of several pesticides against Plutella xylostella on Brassica oleracea

田间药效试验表明,特杀螟(55%杀单·苏WP)750g·hm-2对甘蓝小菜蛾药后5d的防效为85.3%,高于千胜(16000IU·μL-1BtSC)750ml·hm-2的61.1%的防效、惠达(1.5%苏·阿WP)750g·hm-277.6%的防效、宝玉(1.9%苏·甲维盐WP)300g·hm-279.0%的防效以及Bt+氟铃脲600g·hm-283.2%的防效,低于Bt+三氟氯氰菊酯600g·hm-288.9%的防效、尽克(90%灭多威SP)450g·hm-294.2%的防效。防治甘蓝小菜蛾可以选用特杀螟750g·hm-2、Bt+三氟氯氰菊酯600g·hm-2、Bt+氟铃脲600g·hm-2轮用和混用为好。

It demonstrate from field trial that:the control effect of 55% monosult ap·bacillus thuringiensis WP at 750g·hm-2 to 3 instar Plutella xylostella larv ae is 85.3% 5 days after Brassica oleracea treated,and is higher than that of 16 000IU/ul bacillus thuringiensis SC at 750mL·hm-2 which is 61.1%,and higher tha n that of 1.5% avermectin WP at 750g·hm-2 which is 77.6%,and higher than that of 1.9% bacillus thuringiensis. emamectin-benzoate WP at 300g·hm-2 which is 79 .0%,and also higher than Bt+hexaflumuron at 600g·hm-2 which is 83.2%,and is low er than that of Bt+cyhalothrin at 600g·hm-2 which is 88.9%,and lower than that of 90% methomyl SP at 450g·hm-2 which is 94.2%. So the pesticides:55% monosulta p·bacillus thuringiensis WP,Bt+hexaflumuron and Bt+cyhalothrin can be chosen to control Plutella xylostella on Brassica oleracea by combining them or using the m in turn.