甜菜夜蛾在潍坊市大发生１９９７年甜菜夜蛾在潍坊市玉米、大豆、蔬菜、花生、甘薯等作物上大暴发，各种作物累计发生面积达２１．３万ｈｍ２，为历史罕见。该虫在潍坊市１ａ发生５代，世代重叠严重，发生为害盛期集中在７～９月份。据７～９月份各地调查，晚播玉米、大豆... Beet armyworm occurred in Weifang city Beet armyworm outbreak in 1997 in Weifang city corn, soybeans, vegetables, peanuts, sweet potatoes and other crops, the cumulative occurrence of various crops reached 213,000 hm2, a rare history. The insects in Weifang City, 1a occurred in 5 generations, generations overlap seriously, occurred during the peak of damage concentrated in the 7 ~ September. According to the survey from July to September, late sowing corn, soybeans ...