粘虫在广东主要于9—10月间为害水稻、1—3月间为害小麦,往往猖獗成灾。解决粘虫大发生的虫源问题,是掌握发生规律、准确进行预测预报和贯彻防重于治的重要前提。关于广东晚稻粘虫大发生前的虫源问题,存有争论。1961年广东省粘虫会议上多数代表认为本省粘虫大发生是以本地虫源为主。1962年 Mythimna separata infesting rice mainly in September-October in Guangdong and wheat in January-March are often rampant. It is an important prerequisite to grasp the law of occurrence, accurately predict and implement the prevention and control of diseases. There are controversies about the source of insects before the occurrence of southern armyworm in Guangdong. In 1961, most representatives of the armyworms meeting in Guangdong Province considered that the occurrence of armyworm in the province mainly occurred on the basis of local insect pests. 1962