不同食物对甜菜夜蛾生长发育参数的影响

选择上海地区近年甜菜夜蛾Spodoptera exigua(Hübner)发生比较严重的甘蓝、豇豆、大葱、芦笋4种寄主植物,在温度(27±1)℃,相对湿度70%±5%,光照L:D=14:10的条件下研究了不同寄主植物对甜菜夜蛾发育特征的影响。结果表明,不同寄主植物饲喂甜菜夜蛾,甜菜夜蛾幼虫发育历期、存活率、蛹重、成虫寿命、净生殖力和内禀增长率等参数在寄主植物间有显著差异。用甘蓝饲喂的甜菜夜蛾雌虫产卵量明显高于取食大葱和芦笋的。同样,取食甘蓝的甜菜夜蛾蛹重、净生殖力和种群内禀增长率等参数明显高于取食大葱和芦笋的,说明甘蓝与其他寄主植物相比提供了较好质量的食物。

Effects of different host plants on development of Spodoptera exigua

In recent years beet armyworm Spodoptera exigua（Htibner） has seriously infested crops of cabbage, cowpea, scallion and asparagus in the Shanghai area. The impact of host plant selection on development of S. exigua were investigated in the laboratory at （27 ± 1 ）℃ , RH 70% - 5% , and photoperiod of L： D = 14： 10. The results revealed significant differences between host plants in duration of larval development, larval survival rate, pupal weight, adult longevity, adult eclosion, the intrinsic rate of increase and net reproduction rate. The mean number of eggs laid by females reared on cabbage was significantly greater than for those reared on scallion or asparagus. Similarly, pupal weight, adult eclosion, the intrinsic rate of increase, and net reproduction rate were significantly higher on cabbage than on scallion and asparagus. The results suggest that cabbage provides better food quality for beet armyworm than other host plants.