拟除虫菊酯类杀虫剂对棉铃虫雌蛾化学通讯系统的影响

Effects of pyrethroid insecticides on chemical communication system of female cotton bollworm,Helicoverpa armigera

用低致死剂量（LD30）氰菊酯和氰戊菊酯胸部点滴处理棉铃虫3龄幼虫后，研究拟除虫菊酯类杀虫剂对存活雌蛾化学通讯系统的影响。结果表明，杀虫剂对雌蛾的求偶行为不产生明显影响，对照组和杀虫剂处理组雌蛾的求偶高峰均为第3个暗期的8-8．5h，求偶率均可达73％-82％。氰戊菊酯处理组中雌蛾性信息素各组分滴度和总量与对照无显著性差异，但溴氰菊酯处理组中雌蛾性信息素的主组分Z11-16：Ald和次要组分Z9-16：Ald、Z7-16：Ald的滴度及信息素总量均显著高于对照组，并且两个活性组分Z11-16：Ald和Z9-16：Ald的比例与对照组雌蛾有显著差异。

The third instar larvae of cotton bollworm, Helicoverpa armigera （Htibner） （Lepidoptera： Noctuidae）, were topically treated with two pyrethroid insecticides deltamethrin and fenvalerate, at dosages causing 30% mortality （ LD30 ） to determine their effects on chemical communication system of the a- dult survivors. The results showed that pyrethroids had no effect on the calling behaviors of the survivors, and 73% -82% calling behavior appeared at 8 -8.5 h after the initiation of darkness at the third scotophase on the treated and untreated females as well. No difference appeared between the titer and percentage of the sex pheromone components in control females and female survived from larvae treated with fenvalerate. However, the titers of major component, Z11-16 ： Ald, and the minor components, Z9-16 ：Ald and Z7-16 ： Aid, as well as the total titers of the sex pheromone blend in the survived female moths treated with dehamethrin were significantly higher than that of the untreated female moths. The ratio of two active components, Z11-16 ： Aid to Z9-16 ： Aid in the female moths treated with dehamethrin differed significantly from untreated female moths.