小菜蛾颗体病毒与苏云金杆菌混合悬浮剂防治小菜蛾的田间药效试验

THE FIED TEST OF USING PXGV+BT TO CONTROL PLUTELLA XYLOSTELLA L.

田间药效结果表明,小菜蛾颗体病毒与苏云金杆菌混合悬浮对小菜蛾(Plutellaxylostella L.)有较好的防治效果,药后5天,小菜蛾颗体病毒与苏云金杆菌混合悬浮剂高剂量组100ml/667m2的防效为77.46％明显高于对照药剂高效Bt可湿性粉剂,药后7d防治效果仍达75.89％。该药剂对菜青虫具有一定的兼治作用,对天敌影响较少,田间药效表现较为迟缓,试验期间无药害现象发生。能降低化学农药的使用量,有助于延缓害虫抗药性的产生,减少对环境的影响,促进绿色食品的产生。田间使用防治小菜蛾时,以其商品量75-100ml／667m2左右为宜。

In field, the results showed: PxGV: 1×108PIB/ml+ Bt: 2×106 IU/ml was effective for controlling Plutella xylostella L. After spraying the 5d, it had 56. 94% - 77.46% of controlling effect; After spraying pesticides 7d, it had 50. 80%-75. 89% of controlling effect, and it was secure for green cauliflower.