小麦纹枯病是一种真菌性病害，病菌以菌核、菌丝在土壤和病残体上越夏、越冬。播种后开始侵染危害，春天继续危害蔓延。发病的适宜温度为20℃左右，春夏雨水多、土壤湿度大、氮肥多、密植，通风透光不良等条件下发病较重.1.症状识别播后病菌危害可引起烂种，麦芽不能出土。幼苗 Wheat sheath blight is a fungal disease, bacteria to sclerotia, mycelium in the soil and disease on the more summer, winter. Infestation begins after sowing and continues to spread in spring. Incidence of the appropriate temperature of about 20 ℃, spring and summer rain and more soil moisture, more nitrogen, dense planting, poor ventilation and other conditions of severe disease conditions .1. Identification of germs after sowing germs can cause bad, malt can not unearthed . seedling