Spodoptera exigua (Hübner) is an important agricultural pest with worldwide distribution. Monitoring the population dynamics of adults and predicting the occurrence of next generation are the basis of prevention and control. Insect attractants are based on preferences for foods or their volatiles and have great potential for pest monitoring and management. To evaluate the monitoring success of food attractants on S. exigua populations in the field, we first quantitatively analyzed the reproductive organ development of adults in a laboratory population. The ovarian development of females was divided into four stages. The length range of the testis major axis of males at different ages was established according to the principle of testis development. This allowed documentation of the reproductive status of adults trapped in the field. In 2019 and 2020, we used food attractant trapping combined with reproductive system examination to monitor the population dynamics and reproductive development of S. exigua adults in natural environment. The results showed obvious generational changes in the population density dynamics of males and females of S. exigua. During the two-year monitoring period, the ovarian development level and mating times of trapped females in the second generation increased at first and then decreased with time. The number of eggs within ovarioles trapped initially decreased and then increased over time. The ovarian development level and mating times of trapped females in the third-generation adults increased gradually over time, and the number of eggs in female ovarioles decreased gradually over time. The age of trapped males in the second generation initially increased and then decreased over time. The age of males in the third generation increased gradually over time. There were significant differences in the reproductive development of female and male moths trapped in different generations in 2019. This study showed that trapping using food attractants can monitor field population dynamics of S. exigua. Combined with examination of reproductive system anatomy, it can monitor the reproductive organ development, mating, and oviposition status of wild adults.

夜蛾（Spodoptera exigua）（Hübner）是一种重要的农业害虫，分布在世界各地。监测成年人的种群动态并预测下一代的发生是预防和控制的基础。昆虫引诱剂基于对食物或其挥发物的偏好，在虫害监测和管理方面具有巨大潜力。评价S. exigua上食物引诱剂的监测成功在田间种群中，我们首先定量分析了实验室种群中成年人的生殖器官发育。女性的卵巢发育分为四个阶段。根据睾丸发育的原理，确定了不同年龄段男性睾丸主轴的长度范围。这可以记录被困在田间的成年人的生殖状况。在2019年和2020年，我们将食物引诱剂诱捕与生殖系统检查相结合，以监测自然环境下埃克森（S. exigua）成虫的种群动态和生殖发育。结果表明，S。exigua的雄性和雌性种群密度动态发生了明显的世代变化。。在为期两年的监测期内，第二代雌性的卵巢发育水平和交配时间先增加后随时间减少。随着时间的流逝，被捕获的卵巢内卵的数量开始减少，然后增加。随着时间的推移，第三代成年雌性的卵巢发育水平和交配时间逐渐增加，雌性卵巢中的卵数随着时间逐渐减少。随着时间的推移，第二代被困男性的年龄开始增加，然后下降。随着年龄的增长，第三代男性的年龄逐渐增加。在2019年，不同世代被困的雌性和雄性蛾的生殖发育存在显着差异。S. exigua。结合检查生殖系统解剖结构，它可以监视野生成年人的生殖器官发育，交配和产卵状态。