8种杀虫剂对榕透翅毒蛾的室内防效

Indoor Control Efficacy of 8 Insecticides against Perina nuda

为明确不同杀虫剂对榕透翅毒蛾不同龄期的敏感度,研究采用胃毒法测定了8种杀虫剂稀释500倍、1000倍和1500倍3种浓度分别对榕透翅毒蛾初孵幼虫和3龄幼虫的毒杀活性。结果表明:8种杀虫剂均具有一定的防治效果,其中5%阿维菌素、12%甲维·虫螨腈、15%甲维·茚虫威对榕透翅毒蛾初孵幼虫防治效果较好,3种浓度在24 h后校正死亡率均达100%;15%甲维·茚虫威、12%甲维·虫螨腈和4.5%高效氯氰菊酯的500倍和1000倍浓度对榕透翅毒蛾3龄幼虫具有较好的防治效果,在24 h后校正死亡率均达100%;3龄幼虫较初孵幼虫而言,耐药性更强,同一药剂同一浓度处理下3龄幼虫的校正死亡率更低或达到100%校正死亡率时间更长。因此,可选用5%阿维菌素、12%甲维·虫螨腈、15%甲维·茚虫威和4.5%高效氯氰菊酯作为当前防治榕透翅毒蛾的主要防治药剂。

In order to clarify the susceptibility changes of different insecticides at different concentrations to different instars of the Perina nuda,diluted 500 times,1000 times,and 1500 times concentrations of the 8 insecticides were determined on the newly hatching and third instar larvae of P.nuda in laboratory by stomach toxicity method.The results showed that 8 insecticides had a good control effect,among which 5%Avermectin EC,12%Emamectin benzoate·chlorfenapyr SC and 15%Emamectin Indoxacarb SC had a better control effect on the newly hatching larvae,and the corrected mortalities of the three concentrations all reached 100%after 24 hours,diluted 500 times and 1000 times concentrations of 15%Emamectin Indoxacarb SC,12%Emamectin benzoate·chlorfenapyr SC,and 4.5%Lambda-cyhalothrin EC also showed same control effects on the third instar larvae of the P.nuda.The third instar larvae were more resistant than the newly hatched larvae of insecticides,and the corrected mortalities was lower or reached 100%for a longer time.As a result,5%Avermectin EC,12%Emamectin benzoate·chlorfenapyr SC,15%Emamectin Indoxacarb SC,and 4.5%Lambda-cyhalothrin EC are recommended to be used for the control of P.nuda.