草地螟在我县继１９９６、１９９７年大面积发生危害后，１９９８年在大豆、葵花、甜菜、玉米、马铃薯等作物上再次暴发成灾。全县发生面积达８万ｈｍ２，其中严重发生面积６万ｈｍ２，发生面积占全县种植面积的８０％。据６月２４～２５日田间调查，草地螟幼虫最高密度：... Meadow borers in my county following the 1996 and 1997 large-scale damage occurred in 1998 in soybean, sunflower, beet, corn, potatoes and other crops once again outbreaks. The county occurred an area of ​​80,000 hm2, of which a serious area of ​​60,000 hm2, the occurrence of the area accounted for 80% of the county planted area. According to June 24 ~ field survey, the highest density of grasshopper larvae: ...