小麦赤霉病的症状及其防治麦类赤霉病分布遍及全国，但主要发生和流行在春季温暖多雨潮湿的淮河以南及长江中下游冬春麦区，东北春麦区的局部地区也常严重发生。近年来陕西、山西等省区小麦穗期多雨的年份，为害也较严重．严重时病穗率达４０％─８０％，减产达５－６成．... Wheat head blight symptoms and its control Wheat scab does spread throughout the country, but the main occurrence and prevalence in the spring warm and humid south of the Huaihe River and the middle and lower reaches of the Yangtze River winter spring wheat area, northeast spring wheat area is also often severe occur. In recent years, Shaanxi, Shanxi and other provinces and provinces rainy wheat spike years, more serious damage. In severe cases, panicle disease rate of 40% ─ 80%, yield reduction of 5-6 into. ...