广东省草地贪夜蛾种群周年动态及发生特征

为了明确广东省草地贪夜蛾Spodoptera frugiperda (J. E. Smith)种群周年消长动态及发生特征，根据2020年和2021年广东省草地贪夜蛾性诱监测及田间调查数据，分析不同生态区草地贪夜蛾成虫及幼虫种群周年发生动态。结果表明：(1) 草地贪夜蛾在广东省大部分冬种玉米区可以周年繁殖，仅在清远、韶关、河源等地未发现幼虫为害；不同地区之间草地贪夜蛾越冬虫源基数差异较大，粤西发生为害较重，珠三角及粤东地区发生相对较轻；(2) 周年繁殖区草地贪夜蛾成虫和幼虫全年均可发生为害，而季节发生区一般于3-4月才零星始见草地贪夜蛾成虫和幼虫，且诱蛾量、幼虫种群数量及为害程度均相对较低；(3) 广东省草地贪夜蛾种群消长动态呈多峰型，发生高峰期主要集中于5-10月，期间出现多个大小不等的高峰，但峰期、蛾量和虫量在不同地区之间差异较大。本研究明确了广东省不同生态区草地贪夜蛾种群的周年消长动态及发生特征，为广东省乃至全国草地贪夜蛾的早期预警和精准防控提供重要参考。

Seasonal population dynamics and occurrence characteristics of the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae) in Guangdong Province

In order to clarify the seasonal population dynamics and occurrence characteristic of Spodoptera frugiperda in Guangdong Province, the population dynamics of adult and larva of S. frugiperda in different ecological regions of Guangdong Province were analyzed based on the data of sex induction monitoring and field investigation between 2020 and 2021. The results were as follows: (1) The year-round breeding regions of S. frugiperda were mainly distributed in most winter corn planting areas of Guangdong Province, while no larva had been found in Qingyuan, Shaoguan and Heyuan in winter. Furthermore, the overwintering cardinal number of S. frugiperda in different regions varied significantly. Seriously winter corn damage of S. frugiperda was found in western Guangdong. While slightly infestation areas of pest were in the Pearl River Delta and Eastern Guangdong. (2) Fall armyworm adult and larva can occur all year round in year-round breeding region of Guangdong Province, while sporadically found from March to April in the seasonal occurrence region. Compared to the year-round breeding region, the population density of moth and larva and corn damage degree remained at a low level in the seasonal occurrence region. (3) Fall armyworm adult and larva had multiple and different-sized density peaks from May to October. The peak period and population density of moth and larva of S. frugiperda fluctuated widely between different regions. The investigation results clarified the annual population dynamics and occurrence characteristics of S. frugiperda in different ecological regions of Guangdong Province, which would present a scientific basis for the early warning, prediction and source control of S. frugiperda in Guangdong Province and even China.