入侵害虫草地贪夜蛾取食七种食物的种群生命表

为阐明入侵害虫草地贪夜蛾Spodoptera frugiperda对我国不同农作物的适应性，利用年龄-阶段两性种群生命表技术研究取食玉米粒以及玉米、花生、棉花、大豆、高粱和谷子叶片等7种不同食物对草地贪夜蛾生长发育与繁殖的影响。结果表明，不同食物显著影响草地贪夜蛾种群。整个成虫前期从长到短依次为取食棉花叶>取食大豆叶>取食高粱叶>取食花生叶>取食谷子叶>取食玉米叶>取食玉米粒，取食玉米粒要比取食棉花叶的时间缩短27.95 d。雌雄成虫寿命均以取食玉米粒和高粱叶的最长，以取食玉米叶的较短，且取食棉花叶的雄成虫寿命仅有3.00 d。产卵量以取食玉米粒的最多，为619.27粒，是取食其他食物的6.00倍～61.25倍。取食玉米叶的草地贪夜蛾初孵幼虫个体完成幼虫、蛹和成虫阶段的概率均较高，分别为95.38%、78.46%和78.46%，而取食棉花叶的最低，分别为37.29%、20.34%和20.34%。草地贪夜蛾取食玉米粒的净增值率、内禀增长率、周限增长率均最高，分别为105.59、0.12 d-1、1.13 d-1，平均世代周期最短，为36.91 d，而取...

Life tables of the invasive insect pest fall armyworm, Spodoptera frugiperda feeding on seven crops

To elucidate the adaptability of the invasive insect pest fall armyworm, Spodoptera frugiperda, to different crops in China, the growth, development and reproduction of S. frugiperda reared on maize grains and maize, peanut, cotton, soybean, sorghum, and millet leaves were assessed using the age-stage two-sex life table technique. The results showed that different foods significantly affected S. frugiperda populations. The order of pre-adult durations from longest to shortest was cotton leaves, soybean leaves, sorghum leaves, peanut leaves, millet leaves, maize leaves and maize grains, and it was 27.95 d shorter on maize grains than on cotton leaves. The longevity of male and female adults fed on maize grains and sorghum leaves was the longest, but shorter when fed on maize leaves. The longevity of male adult was only 3.00 d on cotton leaves. The female adults produced the most eggs(619.27 eggs) on maize grains, which was 6.00-61.25 times of those on other foods. The probability that the newly hatched larvae fed on maize leaves completed larval, pupal and adult stages was the highest, which was95.38%, 78.46% and 78.46%, respectively, while it was the shortest on cotton leaves, which was 37.29%, 20.34% and 20.34%, respectively. The net reproductive rate, intrinsic rate of increase and finite rate of increase of S. frugiperda fed on maize grains were the highest, with a shortest mean generation time, which were 105.59, 0.12 d^-1, 1.13 d^-1 and 36.91 d, respectively. In contrast, the results on cotton leaves were the opposite, while the results on the other five foods fell in between them. In conclusion, S. frugiperda could complete its life cycle on all tested foods, although it preferred maize crops, especially maize grains, while cotton leaves and soybean leaves were the least preferred.