斜纹夜蛾成虫在不同寄主上的繁殖行为日节律
Diurnal rhythm of reproductive behavior of cotton leafworm Spodoptera litura (Fabricius)(Lepidoptera: Noctuidae)feeding on different hosts

为摸清斜纹夜蛾成虫在不同寄主上的行为节律变化, 在室内分别用烟草和白菜饲养3代, 建立烟草种群和白菜种群, 比较分析了成虫的羽化、交配、产卵等行为节律。结果表明：烟草种群雌虫有2个羽化高峰期, 分别在熄灯前2 h和熄灯后1 h, 雄虫只有1个高峰期, 出现在熄灯后2 h;白菜种群雌、雄虫均有2个高峰期, 主、次高峰期分别在熄灯前后1 h内和熄灯后4～5 h。2种群均有2个交配高峰期, 烟草种群第1高峰期在熄灯后2 h, 而白菜种群在熄灯后5 h, 第2高峰期均在开灯前2 h;烟草种群和白菜种群一生的交配持续时间分别为54.78±3.09 min和60.00±2.58 min, 差异不显著;烟草种群一生交配1～3次, 而白菜种群只交配1次, 差异极显著;2种群均只有1个产卵高峰期, 烟草种群在熄灯后4 h, 白菜种群则在熄灯后5 h。表明斜纹夜蛾取食烟草和白菜2种不同寄主其成虫繁殖节律会发生较大的改变。
In order to find out the differences in the behavioral rhythm of Spodoptera litura adults on different host plants, diurnal rhythms of adult emergence, mating and ovulating between tobacco population and cabbage population were carefully researched for three generations indoors. The results showed that the diurnal rhythm of two host populations were different. Female adults of tobacco population had two emergence peaks: one appeared two hours before lights out and the other one hour after lights out; males had only one peak that appeared two hour after lights out. Both male and female adults of cabbage population had two emergence peaks: the main peak appeared one hour before and after lights out and the subordinate peak appeared between four and five hours after lights out. Mating and ovulating behaviors of both populations appeared at night. Both populations had two mating peaks: the first peak of tobacco population appeared two hours after lights out, while the cabbage population appeared five hours after lights out; the second appeared two hours before lights on. Two populations had only one ovulating peak: the tobacco population appeared four hours after lights out, while the cabbage population appeared five hours after lights out. The lifetime mating duration of the tobacco population and cabbage population were 54.78±3.09 min and 60±2.58 min, respectively, and they were not significantly different. Tobacco population mated 1-3 times, but cabbage population mated only one time. The results indicated that the reproductive diurnal rhythm of S. litura varied after they fed on tobacco and cabbage.