The fall armyworm (Spodoptera frugiperda) has lately been a threat to maize and other crops in the graminaceous family in most parts of the world. For a long time, this devastating pest has been a resident of the Western Hemisphere. However, in 2018, it was reported in Africa, and subsequently in Asia in 2019. This study aimed to understand the reproductive system of virgin and mated female fall armyworm to be able to envisage its population trend and hence suggest how to contain its infection. The virgin and copulated females were dissected to observe their reproductive structures. There was no significant difference in the number of ovarioles in each ovary due to the mating of Spodoptera frugiperda, although ovarian development was affected. Notably, the ovaries enlarged in the early stages after adult emergence, and there was more yolk deposit present in mated females than virgin females. It was found that ovarian advancement begins in the pupal stage. It was also noted that the beginning of ovarian development happens 4–5 days after the pupation of the female. At this stage, the ovarioles begin to develop. However, no eggs or yolk deposition were observed. Stage six, which is the final stage of oviposition, occurs 20 and 24 days after female adult emergence. After mating, oviposition occurs between 11 and 13 days and ends with their mortality. This study goes a long way in understanding the population trend of fall armyworm and hence determining the best stage for control. The results will also be useful to the researchers who are currently working on this insect in laboratories around the world to sustain the fall armyworm populations for further experiments.

草地贪夜蛾（Spodoptera frugiperda）最近对世界大部分地区的玉米和其他禾本科作物构成威胁。长期以来，这种毁灭性害虫一直居住在西半球。然而，2018 年，非洲报道了这种情况，随后于 2019 年在亚洲报道了这种情况。这项研究旨在了解未交配和交配的雌性秋粘虫的生殖系统，以便能够预见其种群趋势，从而提出如何控制其感染的建议。解剖处女和交配的雌性以观察它们的生殖结构。草地贪夜蛾的交配虽然影响了卵巢的发育，但每个卵巢中卵巢孔的数量没有显着差异。值得注意的是，在成虫出现后的早期阶段，卵巢增大，并且交配雌性中的卵黄沉积物比处女雌性更多。研究发现，卵巢发育从蛹期开始。还指出，卵巢发育开始发生在雌性化蛹后 4-5 天。在这个阶段，卵巢开始发育。然而，没有观察到卵或蛋黄沉积。第六阶段是产卵的最后阶段，发生在雌性成虫羽化后 20 和 24 天。交配后，产卵发生在 11 至 13 天之间，并以死亡告终。这项研究对于了解草地贪夜蛾的种群趋势并确定最佳防治阶段大有帮助。这些结果对于目前在世界各地实验室研究这种昆虫的研究人员也很有用，以维持秋粘虫种群进行进一步的实验。