金龟子幼虫为害苗圃花卉、苗木,在北京地区日趋严重,虫口密度越来越大,严重地块多的每平方米有蛴螬40多头,少的也有10多头。如一株二年生泡桐树有10多头蛴螬为害,一盆月季有蛴螬2～3头为害。东北旺苗圃1983～1985年,由于蛴螬为害,被害死亡率在11～33.7％,经济损失严重年份达到8万元以上。自1986年以来,在摸清金龟子优势种发生规律的基础上,采取综合防治措施,基本上控制了蛴螬的为害,取得了明显的经济效益。一、为害花卉、苗 Chafer larvae damage nursery flowers, nursery stock, increasingly serious in the Beijing area, insect population density is increasing, serious blocks and more per square meter there are 蛴 螬 40 long, there are also less than 10 long. For example, a perennial Paulownia tree has more than 10 蛴 螬 damage, a pot of roses have 蛴 螬 2 to 3 head damage. Northeast Mong nursery from 1983 to 1985, due to cricket damage, the mortality rate of 11 ~ 33.7%, the serious economic loss of 80,000 yuan or more. Since 1986, on the basis of ascertaining the regularity of the dominant species of chafer, comprehensive control measures have been taken to basically control the scab of the scallop and significant economic benefits have been achieved. First, damage flowers, seedlings