应用氯氰菊酯和B.t.i H-14混配杀虫剂现场防治城市蚊幼虫的效果评价

采用常量喷雾或注射器滴注方法观察氯氰菊酯、B .t.iH 1 4混配杀虫剂对城市中小型蚊幼虫孳生地现场防治蚊幼虫的效果。结果表明用 2 5mg L、5 0mg L混配杀虫剂分别处理蚊幼虫孳生地 ,1天后蚊幼虫下降率均为 1 0 0 %。容器指数由处理前的 5 3 5和 5 1 6下降至零的持效期分别为 1 4和 2 1天。2 5mg L混配杀虫剂在 2 1天内的毒杀持效与单独使用 5 0mg LB t iH 1 4、1 0mg L氯氰菊酯相当 ,而5 0mg L混配杀虫剂持效比单独使用 5 0mg LB .t.iH 1 4,1 0mg L氯氰菊酯延长 7天 ,表明混配杀虫剂在现场能有效防治蚊幼虫 ,减少化学杀虫剂的用量。

Efficiency evaluation of field control of mosquito larvae with cypermethrin and B.t.i H-14

The efficiency of field control of mosquito larvae with cypermethrin and Bacillus thuringiensis mixed insecticide was investigated using spraying or topical application. The decrease rates of larvae numbers were 100% after the growing places of small and medium sized larvae were treated with the mixed pesticide both at 2 5 mg/L and 5 0 mg/L in 24 hours. The duration of the container index decreased from 53 5 and 51 6 to zero was 14 and 21 days respectively. The toxicity duration of the mixed insecticide at 2 5 mg/L was the same as that of 5 0 mg/L B.t.i H 14 or 1 0 mg/L cypermethrin (21 days), while the duration at 5 0 mg/L was 7 days longer than that of 5 0 mg/L B.t.i H 14 or 1 0 mg/L cypermetrin. These results indicated that the mixed insecticide was effective in the field control of mosquito larvae at a reduced expense.