金针虫对银杏苗的危害极大，主要发生在低洼地和水湿地，春季多雨、土壤湿度大可加重危害。当3—4月份10cm深处的土温达6℃时，该虫开始活动，顺银杏种芽裂痕钻进种子啃吃种胚及幼芽，上温升至7—13℃时，咬食幼苗须根及未形成纤维的地下茎，使之不能正常生长，被危害幼苗的主 Gilt insects on ginkgo seedlings great harm, mainly in low-lying land and water wetlands, rainy spring, soil moisture can aggravate the harm. When the soil temperature at 10cm depth reached 6 ℃ in March-April, the insect began to move, ginkgo seed germination and buds were drilled along the seeds of ginkgo seed germination, and the seedlings were bite when the temperature rose to 7-13 ℃ The fibrous roots and roots are not formed underground, so that it can not grow normally, is the main harm to seedlings