豆天蛾是我市大豆田的主要害虫之一,常年发生20万亩左右。1990年全市种植大豆49.63万亩,豆天蛾发生面积达47.74万亩,占播种面积的96.2％。尤其是沿黄河滩区发生更重。一般减产5-10％,严重者豆株被吃成光杆减产50％以上。 封丘县测报站一台黑光灯全年诱蛾量为3023头,除比大发生的1983年(3996头)、1984年(3605)头)稍低外,均高于其它年份,比1985-1989年的平均值多56.8％。发蛾高峰 Bean moth is one of the main pests in our city soybean field, perennial occurred about 200000 acres. In 1990, the city planted 496,300 hectares of soybean, and the occurrence area of ​​moths reached 477,400 mu, accounting for 96.2% of the sown area. Especially along the Yellow River beach area occurred heavier. The general cut 5-10%, in serious cases were eaten bean spike cut more than 50%. In Fengquxian County, a black light lamp was used in the survey year, with a total number of 3023 moths, which was higher than the other years except for 1983 (3996 heads) and 1984 (3605 heads) The average in 1989 was 56.8% more. Hair moth peak