【目的】 为明确南繁区草地贪夜蛾在4种重要作物玉米、水稻、花生和辣椒上的取食偏好、产卵选择及适合度。【方法】 采用叶碟法和养虫笼产卵法，测定草地贪夜蛾幼虫对4种寄主植物的取食选择率及成虫在4种寄主植物上产卵的卵块数、卵粒数、卵块比和着卵率，并比较了取食不同寄主植物后草地贪夜蛾幼虫发育历期、幼虫和蛹的存活率、雌成虫的寿命和繁殖力。【结果】 不同龄期草地贪夜蛾幼虫均对玉米表现出强烈的取食偏好性，但随着龄期增长，对其余3种寄主的取食选择率呈上升趋势，在4种寄主上的取食偏好性整体表现为玉米＞水稻＞花生＞辣椒。草地贪夜蛾雌成虫在4种寄主上的产卵喜好顺序为玉米＞花生＞辣椒＞水稻，在4种寄主上的产卵量分别为玉米（1 208.60 ± 34.91）粒、花生（331.40 ± 32.83）粒、辣椒（186.60 ± 20.14）粒、水稻（169.20 ± 27.77）粒，在玉米和花生上第2天产卵量最多，在辣椒和水稻上第3天产卵量最多。此外，草地贪夜蛾幼虫在4种寄主上的发育历期由长到短表现为辣椒>水稻>花生>玉米，在辣椒上不能发育到6龄。在4种寄主上幼虫和蛹的存活率由大到小表现为玉米>花生>水稻>辣椒，在辣椒上发育到4龄时就几乎全部死亡。取食不同寄主的草地贪夜蛾发育到成虫后，其成虫寿命由长到短表现为玉米>花生>水稻，单雌产卵量表现为玉米>水稻>花生。【结论】 草地贪夜蛾在玉米、水稻和花生3种寄主植物上均能实现种群繁殖，在辣椒无法完成生活史。

[Objectives]  To determine the feeding and oviposition preferences, and fitness, of Spodoptera frugiperda feeding on four important crops (corn, chili, rice and peanuts) in the Nanfan area. [Methods]  The leaf disc method was used to determine the relative preference of S. frugiperda larvae for each of the above four host plants. Oviposition preferences were determined by restricting adult females to one of the four host plants and comparing the number of eggs masses, number of eggs, percentage of egg mass and percentage of eggs, laid on each host plant species. The developmental duration and survival rate of larvae and pupae, and adult female longevity and fecundity, were compared between insects raised on different host plants. [Results]  Different larval instars showed a strong preference for corn, but preference for the other three host plants tended to increase with larval instar. The four host plants can be ranked in terms of preference as follows: corn > rice > peanut > pepper, and in terms of suitability for oviposition as: corn > peanut > pepper > rice. The number of eggs laid on each of the four host plants was: corn (1 208.60 ± 34.91), peanut (331.40 ± 32.83), pepper (186.60 ± 20.14) and rice (169.20 ± 27.77). Most eggs were laid on the second day on corn and peanuts, and on the third day on chili and rice. In addition, the developmental duration of larvae on the four host plants can be ranked as follows: pepper > rice > peanut > corn. Larvae could not develop to the sixth instar on pepper. The survival rate of larvae and pupae on the four host plants can be ranked: corn > peanut > rice > pepper. Almost all larvae died at the fourth instar stage on pepper. [Conclusion]  The four different host plants tested significantly affected the development, fecundity, survival and longevity of S. frugiperda. Host plants can be ranked in terms of adult life span as follows: corn > peanut > rice, and in terms of the number of eggs laid per female as: corn > rice > peanut. S. frugiperda can successfully reproduce on corn, rice and peanut, but cannot complete its life cycle on pepper.