南充市草地贪夜蛾发生情况调查分析

Occurrence and Cause Analysis of Spodoptera frugiperda in Nanchong City

本文对南充市周边县(市、区)草地贪夜蛾迁飞轨迹、降落地形和受害玉米生育期展开调查。结果表明,草地贪夜蛾前期在南充市主要沿嘉陵江从下游往上游迁飞,而周边远离江边的乡镇受害较轻;草地贪夜蛾在同个乡镇的不同地势地块分布各有差异,平坦、通风口地形有利于草地贪夜蛾降落危害;在不同生育期中草地贪夜蛾更倾向于在玉米小喇叭口期取食危害。

This paper investigated the migration trajectory,landing pattern of Spodoptera frugiperda and the harmed corn growth period in the surrounding counties(cities,districts)of Nanchong City.The results showed that Spodoptera frugiperda migrated from downstream to upstream along the Jialing River in Nanchong City in the early stage,while the surrounding townships far away from the river suffered less damage;Spodoptera frugiperda had different distributions in different land plots in the same township,the flat and ventilation opening terrain was conducive to the fall of Spodoptera frugiperda;in different growth periods,Spodoptera frugiperda was more likely to feed on corn at the small bell-mouth stage.