豆天蛾主要危害大豆,但也危害绿豆、豌豆、洋槐等豆科植物。 豆天蛾在滦南县一年发生一代,以幼虫危害大豆叶,轻者可将叶片食成缺刻和孔洞,严重时可将豆叶食光,造成光杆,以致不能结荚而颗粒无收。豆天蛾幼虫发生期为7月中旬至9月上旬,盛期为7月下旬至8月上旬。 Bean main moth damage to soybeans, but also endanger mung beans, peas, acacia and other leguminous plants. Bean spider moth in Luannan County, a generation a year, the larvae endanger the soybean leaves, the light of the leaves can be eaten into a notch and holes, in severe cases the leaves can be eaten, resulting in polished pole, so that can not pod and crop failure. Moth larvae occur from mid-July to early September, with a peak from late July to early August.