安徽歙县大豆主要是夏大豆,几年来遭受害虫的为害十分严重,尤其以豆叶蜂为害最重。现将几年来群众的防治经验和所观察到的习性,整理报导如下。据在城关薛坑口观察,豆叶蜂一年发生三代。第一代幼虫在5月中旬出现;第二代幼虫在6月中旬出现;第三代发生在7月中下旬。以第2—3代受害最 Soybeans in Pixian County of Anhui Province are mainly summer soybean. Pest damage has been extremely serious in recent years, especially in Bees and Stems. The experience of the prevention and control of the masses over the past few years and the observed habits are now tabulated below. According to Xue Hang mouth Chengguan observation, beans and bees occur three generations a year. The first generation larvae appeared in mid-May; the second generation larvae appeared in mid-June; the third generation occurred in late-July. In the 2-3 generations most victims