3种农药对灰蜻稚虫的急性毒性试验

Acute Toxicity of Three Pesticides to Orthetrum Larvae

为减少蜻蜓稚虫对池塘养殖的危害,选用敌百虫、联苯菊酯、噻虫胺3种农药分别对灰蜻终龄稚、0.0517 mg a.i./L。对比3种农药对灰蜻终龄稚虫、已知的淡水鱼类及美国牛蛙蝌蚪的LC_(50)(96 h)值,以及3种农药的水生生态特征,显示噻虫胺是防治蜻蜓稚虫对池塘养殖危害较好的农药。

To select efficient and safe pesticides and control dragonfly larvae in fishing ponds, acute toxicitytests of three pesticides（trichlorfon, bifenthrin and clothianidin） to last- stadium larvae of Orthetrum wereperformed respectively. The results showed that LC_（50）（96 h） values of trichlorfon, bifenthrin and clothianidin tolast-stadium larvae of Orthetrum were 0.2506, 0.0012 and 0.0517 mg a.i./L, respectively. Comparing LC50（96 h）values of the three pesticides to the last-stadium larvae of Orthetrum, freshwater fishes and the tadpole of Rana grylio, and the aquatic ecological characteristics of the three pesticides, clothianidin was recommended as thesuitable pesticide for controlling dragonfly larvae in fishing ponds.