山西省二点委夜蛾发生规律

二点委夜蛾Athetis lepigone(Mschler)]是中国黄淮海夏玉米区一种新的重要苗期害虫,为摸清二点委夜蛾在山西省的发生规律及动态,在山西设置了4个试验点,通过田间定点调查与随机普查、性诱和灯诱等方法对二点委夜蛾的越冬、发生世代和分布等进行了研究。结果表明:二点委夜蛾可在本地越冬;在山西南部冬小麦-夏玉米复播区1年发生4代,越冬代成虫在4月中下旬至5月上旬羽化出土,第1代成虫高峰出现在6月中下旬,第2代成虫高峰出现在7月下旬,第3代成虫高峰出现在9月中旬;根据调查和诱虫结果,绘制了二点委夜蛾在山西临汾的年生活史;二点委夜蛾的分布范围不仅在山西南部夏玉米区,在山西中北部忻州市的春玉米区也有发生,但种群数量很少,不造成危害。

Occurrence of Athetis lepigone in Shanxi Province

Athetis lepigone (M?schler) is a new insect pest occurring in the summer corn seedling stage in Huang-Huai-Hai Summer Corn Region of China. The occurrence and population dynamic of A.lepigone in Shanxi Province, were investigated at four sites by field surveys, sex pheromone traps and light traps. The results showed that A.lepigone can overwinter in local fields, and have 4 generations a year in winter wheat-summer corn region in south of Shanxi Province. The adults of overwintering generation were observed in the middle and late of April to early May, and the peak of the first generation adults, the second generation adults and the third generation adults were in middle and late of June, in late July and in middle September, respectively. Life history of A.lepigone in Linfen, Shanxi was created. A. lepigone not only distributed in summer corn region in south of Shanxi Province, but also in spring corn region in Xinzhou in north of the Shanxi Province with little population and less damage on spring corn.