2003年是中国北方农牧区草地螟的又一个严重暴发年,也是草地螟自1996年以来进入第三个暴发周期以后持续为害的一年。据不完全统计,全国累计发生面积4400万亩以上,发生面积比2002年减少65.6%,但虫口密度大,对发生地区的农业生产安全仍构成严重威胁。1发生为害特点1)以第二代幼虫 2003 is another serious year of outbreak of Meadow Borer in the agricultural and pastoral areas of northern China. It is also a year that the grass borer has continued to cause harm after entering the third outbreak cycle since 1996. According to incomplete statistics, an accumulated area of ​​44 million mu nationwide occurred, with an area of ​​65.6% less than in 2002. However, the density of pest population is still a serious threat to the safety of agricultural production in the area. 1 occurs harm characteristics 1) to the second generation larvae