四川省草地贪夜蛾发生为害特点

为探明草地贪夜蛾在四川的发生为害特点,利用田间调查数据对草地贪夜蛾在四川的发生分布范围、受害作物种类、幼虫种群动态和扩散过程进行了分析。结果表明,草地贪夜蛾在四川除阿坝州外的20个市州都有发生,重发区域集中在川东和攀西地区;受害作物以玉米为主,甘蔗、高粱、小麦和油菜零星受害;在攀西地区和川东北地区观察到2个幼虫为害高峰,其余地区只有1个幼虫为害高峰;草地贪夜蛾在攀枝花市和凉山州局部地区为周年繁殖区,其在四川的扩散总体上呈现出由南向北、由东向西的过程。

Occurrence and damage of the fall armyworm in Sichuan

In order to understand the occurrence and damage of Spodoptera frugiperda in Sichuan, the occurrence and distribution range, host crop, population dynamics of its larvae and the dispersal process of S. frugiperda in Sichuan were analyzed by using field investigation data. The results showed that S. frugiperda occurred in 20 cities of Sichuan except Aba, but seriously occurred in eastern Sichuan and Panxi region. The main host crop of S. frugiperda in Sichuan was corn, with sporadic damage to sugarcane, sorghum, wheat and rape. Two larval population peaks were observed in Panxi and northeast Sichuan, while only one larval population peak was observed in other areas. S. frugiperda could survive the winter in Panzhihua and some parts of Liangshan. The dispersal process of S. frugiperda in Sichuan displayed a trend from south to north and from east to west.