α-三噻吩对白纹伊蚊幼虫的毒杀作用

Toxicity of Alpha-terthienyl to the Larvae of Aedes albopictus

目的 研究α 三噻吩对白纹伊蚊幼虫的杀灭效果、影响因素及其对白纹伊蚊幼虫生长发育的影响。 方法 在实验室特定近紫外光 (UVA)下 ,计数不同药物浓度、不同黑暗处理时间的α 三噻吩作用后蚊幼虫的死亡数、化蛹数及蛹的羽化数 ;在户外自然光下 ,观测不同药物浓度、不同施药时间的α 三噻吩作用后蚊幼虫的死亡数。 结果 实验室特定UVA下 ,α 三噻吩对白纹伊蚊幼虫的半数致死量为 2 .3 7μg/L ;药物与幼虫在黑暗中作用 3h后再施以UVA照射能发挥其最大毒杀作用 ;α 三噻吩能够显著抑制白纹伊蚊幼虫的发育和蛹的羽化。户外自然光下 ,高浓度α 三噻吩在强烈阳光辐射下可以快速杀灭白纹伊蚊幼虫 ,上午 5时施药后 2 4h的毒杀作用显著优于上午 10时和下午 1时。 结论α 三噻吩是一种高效、实用、并能够抑制蚊幼虫生长发育的杀虫剂。

Objective To investigate the toxicity of alpha terthienyl to the larvae of Aedes albopictus , its influencing factors and effect on the larva deve lopment. Methods Under experimental ultraviolet A (UVA),the number of dead,pupal or eclosive mosquito larvae was determined on the condition of different doses of alpha terthienyl and different disposal time in the dark;the number of dead larvae was also determined under sunlight on the condition of different doses of alpha terthienyl and different disposal time to water. Results The LC 50 of alpha terthienyl to Aedes albopictus larvae was 2.37 μg/L under UVA. The best effect was shown when the larvae were incubated with alpha terthienyl 3 h in dark. Alpha terthienyl could significantly inhibit the larva deve lopment and the emergence of the pupae. Under strong sunlight, the larvae were quickly killed by high concentration alpha terthienyl. The 24 hours effect of alpha terthienyl was better when it was applied at 5 AM than that of at 10 AM and 1PM. Conclusion Alpha terthienyl is an effective, practicable larvicide which prohibits the growth and development of the larvae of Aedes albopictus .