杜仲具有较强的抗病虫能力，长江以北各产区杜仲树很少发生病虫害。但近几年苗圃病虫害有发生蔓延的势头，危害杜仲苗木的病虫害主要有根腐病和金龟子。１　苗木根腐病该病害多在苗圃和５年生以下的幼树上发生，严重时造成苗木成片死亡并且逐年蔓延。１１　主要症状　病株根 Eucommia has a strong resistance to pest and disease resistance, Eucommia in the north of the Yangtze River producing areas rarely occur pests and diseases. However, in recent years, nursery pests and diseases have the momentum of the spread of harmful diseases and insect pests of Eucommia seedlings mainly root rot and beetles. 1 seedling root rot disease in the nursery and more than 5-year-old saplings occurred in serious cases caused by seedlings died and spread each year. 1  1 main symptoms of plant roots