不同寄主对草地贪夜蛾生长发育和繁殖的影响

草地贪夜蛾是入侵我国的重大农业害虫,严重威胁我国粮食安全。为明确该虫在不同寄主植物上的适合度,本文系统研究了草地贪夜蛾取食花生、荞麦和生姜3种寄主生长发育和繁殖情况,组建了实验种群生命表。结果表明:草地贪夜蛾在3种寄主植物上的繁殖力高低为花生(771.73粒)>荞麦(477.13粒)>生姜(209.22粒),卵的孵化率无显著差异,幼虫和蛹重均是花生>荞麦>生姜。草地贪夜蛾取食花生、荞麦和生姜后的净增殖率(R 0)分别为226.36、102.45和20.75,内禀增长率(r m)分别为0.16、0.13和0.06。研究发现,草地贪夜蛾在花生、荞麦和生姜3种寄主植物上均能实现种群繁殖,其中,花生是最适宜的寄主,荞麦次之,生姜相对较不适宜。

Effects of different host plants on the development and reproduction of Spodoptera frugiperda

Spodoptera frugiperda is a major agricultural pest that invaded China recently, and it seriously threat to food security. In order to clarify the suitability of S. frugiperda to different host plants, the growth, development and reproduction in peanut, buckwheat and ginger were compared, and the life table was established. The result showed that the reproductions of S. frugiperda feeding peanut, buckwheat and ginger were 771.73 eggs> 477.13 eggs>209.22 eggs respectively, but the hatchabilities of the eggs weren''t significant difference. The weights of both larva and pupa were peanut> buckwheat> ginger. The net reproductive rates (R0) of S. frugiperda after feeding on peanuts, buckwheat, and ginger were 226.36, 102.45, and 20.75, the intrinsic rate of increase ( rm ) were 0.16, 0.13 and 0.06 respectively. The results indicate that S. frugiperda can finish reproduction on all three hosts. Peanut is the most suitable host, followed by buckwheat, and ginger is the least suitable.