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一、发生规律中旬至10月中旬,尤其是8月甜菜夜蛾为害盛期为8月中旬以后易暴发成灾。幼虫盛期最高虫量可达百株390头。1.越冬成活情况:调查结果显示,甜菜夜蛾在豫南不能以
First, the law occurs from mid-October to mid-October, especially the beet armyworm damage peak in mid-August after the outbreak of disaster. Largest era of larvae up to 100 strains of 390 heads. 1 winter survival: survey results show that beet armyworm in the south of Henan can not