近 5ａ来 ,甜菜夜蛾在豫北地区为害日趋严重 ,发生面积逐年扩大 ,由次要害虫上升为主要害虫。 1 999年在秋作物田暴发成灾 ,造成多种农作物大面积减产、品质下降 ,给农业生产带来巨大损失 ,安阳市成灾面积1 4.65万ｈｍ2 。深入分析 1 999年甜菜夜蛾发生特点及大发生原因 ,可为 Nearly 5 years, beet armyworm in northern Henan increasingly serious damage, the occurrence of the area expanded year by year, from secondary to pest rise. In 1999, the outbreak of crop fields in autumn caused disasters, resulting in a large area of ​​a variety of crop yields, declining quality, resulting in huge losses to agricultural production, Anyang City, disaster area of ​​146500 hm2. In-depth analysis of the occurrence of beet armyworm in 1999 and the causes of large occurrence may be