溴氰菊酯泡腾片浸泡蚊帐对淡色库蚊和致倦库蚊的灭效观察

目的在实验室内观察溴氰菊酯泡腾片及乳油浸泡蚊帐对淡色库蚊和致倦库蚊的灭效。方法强迫接触法。结果当药剂浓度为2mg·ai／m2时，溴氰菊酯2种剂型浸帐对淡色库蚊的杀灭效果均达到100％，当药剂浓度达到10mg·ai／m2时，其对致倦库蚊杀灭效果不足100％。溴氰菊酯泡腾片浸泡蚊帐杀灭淡色库蚊的LC50为0．23mg·ai／ml，而乳油浸帐的LC50为0．31mg·ai/ml，方差分析结果表明，二者差异有统计学意义（t=3．04，P=0．023）；溴氰菊酯2种剂型浸帐对致倦库蚊的LC50分别为1．16和1．33mg·ai／ml，差异无统计学意义（t=1．65，P=0．470）。溴氰菊酯的2种剂型均采用5、10和20mg·ai／nl2 3种浓度浸泡蚊帐，对淡色库蚊和致倦库蚊的毒杀效果随着药物浓度的增高，LT50值明显缩短；溴氰菊酯泡腾片浸泡蚊帐对2种蚊虫的灭效均稍强于乳油浸泡蚊帐，且泡腾片浸泡蚊帐对2种蚊虫的击倒死亡时问均短于乳油浸帐。结论溴氰菊酯泡腾片作为一种新剂型浸泡蚊帐具有良好的灭蚊效果。

Efficacy of mosquito nets treated by deltamethrin effervescent tablets on Culex pipiens pallens and Cx.pipiens quinquefasciatus

Objective To evaluate the effect of mosquito nets treated by deltamethrin effervescent tablets or emulsifiable concentrate（EC） on Culex pipiens pallens and Cx. pipiens quinquefasciatus. Methods Mosquitoes were forced to contact treated nets. Results The efficacy of two formulation of deltamethrin to Cx. p. pallens reached 100% at the concentration of 2 mg＇ai/m2 , but that to Cx. p. quinquefasciatus was under 100% at the concentration of 10 mg.ai/m2 . The LC50 of mosquito nets treated with deltamethrin effervescent tablets and EC to Cx. p. pallens were 0.23 mg·ai/ml and 0.31 mg·ai/ml, respectively. There were statistical differences between them （t = 3.04, P = 0. 023）. However, the LC50 of net treated with deltamethrin effervescent tablets and EC to Cx. p. quinquefasciatus were 1.16 mg·ai/ml and 1.33 mg·ai/ml, respectively. There were no statistical differences between them（ t = 1.65, P = 0. 470）. The control efficacy of deltamethrin effervescent tablets and EC to Cx. p. pallens and Cx. p. quinquefasciatus increases with the concentration of chemicals, and nevertheless the values of LT50 distinctly shorten. Mortality and median knockdown time of net treated by ddtamethrin effervescent tablets to Cx. p. pallens and Cx. p. quinquefasciatus were more infective than that of ddtamethrin EC. Conclusion Effervescent tablets, as a new formulation to treat mosquito nets, had a good effect against mosquitoes.