四种药剂防治茶小绿叶蝉的药效

Control efficiency of four pesticides on Empoasca pirisuga and E. flavescens.

在成虫期 6 6 6 7m2 用 70 %杀螟丹 5 0g ,5 8%吡虫啉—杀螟丹混剂A( 1∶4 ) 5 0g,2 2 %吡虫啉—噻嗪酮混剂 ( 1∶4 ) 5 0g ,兑水 75kg,蓬面喷雾 ,对茶小绿叶蝉类药后 7天虫口减退率达 84 5 %～ 93 5 % ,2 0天内维持在 91 6 %以上。 1 0 %吡虫啉用药量偏低 ( 1 0g 6 6 6 7m2 ) ,2 0天的药效仍有 77 2 % ,具速效和持效期长的特点。

In the tea garden 70% cartap sp at 50 g/666.7m 2,58% imidacloprid-cartap mixture wp at 50 g/666.7m 2,and 22% imidacloprid-applaud mixture wp at 50 g/666.7 m 2 were diluted with 75 kg water and sprayed during the adult stage for a control of Empoasca pirisuga and E.flavescens.The control effect was over 84.5%～93.5% at 7rd days. After treatment and over 91.6%～95.4% within 20 days after the treatment. The control effect of 10% imidacloprid wp used at 10 g/666.7 m 2 was still over 77.2% within 20 days after treatment,showing the characteristics of quick and sustainable control effect.