2％苏云金·氟虫腈悬浮剂防治黄脊竹蝗药效试验

Experiment against Ceracris kiangsu with Bt. fipronil 2 % suspension concentrate

于黄脊竹蝗跳蝻上竹前的2龄跳蝻盛发期，用2％苏云金·氟虫腈悬浮剂6．7mL/hm^2兑水地面喷雾，结果表明该制剂对竹蝗的速效性好，持效期长，药后3d的防效可达96．2％以上，且不伤害竹蝗的重要天敌红头芜菁。

In the outbreak period of Ceracris kiangsu nymph in the 2nd instar,Bt, fipronil 2% SC was sprayed at the dosage of 6.7 mL/hm^2. The result showed it was fast acting and long lasting. The control effect was above 96.2% 3 days after the application. And it wouldn＇t harm Epicauta ruficeps,the important nutural enemy of Ceracris kiangsu.