一、小麦纹枯病的发生及危害小麦纹枯病是一种以土壤传播为主的真菌病害。随着产量水平的提高,高产品种的推广和大水、大肥的麦田管理,其危害日趋严重。小麦纹枯病菌的寄主范围广,除侵染小麦以外,还可侵染玉米、水稻、谷子、高梁等多种作物和狗尾草、蟋蟀草、马唐、稗草等禾本科杂草。其主要以菌核或菌丝在土壤内、病残体中越冬、越夏,是主要的 First, the occurrence and harm of wheat sheath blight Wheat sheath blight is a soil-based fungal diseases. With the improvement of production level, the popularization of high-yielding varieties and the management of big-water and big-fat wheat fields, the harm is becoming more and more serious. Rhizoctonia solani has a wide range of hosts, and in addition to wheat, it infects gramineous weeds such as corn, rice, millet, sorghum and other plants such as Setaria viridis, cricket grass, crabgrass and barnyardgrass. Its main sclerotiorin or mycelium in the soil, sick and overwintering, summer, is the main