α-三噻吩对白纹伊蚊幼虫的毒杀作用

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2.37μg/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24h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。

Toxicity of Alpha-terthienyl to the Larvae of Aedes albopictus

OBJECTIVE: To investigate the toxicity of alpha-terthienyl to the larvae of Aedes albopictus, its influencing factors and effect on the larva development. 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 LC50 of alpha-terthienyl to Aedes albopictus larvae was 2.37 microg/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 development 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 1 PM. CONCLUSION: Alpha-terthienyl is an effective, practicable larvicide which prohibits the growth and development of the larvae of Aedes albopictus.