常年都有一些地区因年前低温影响,局部地方出现小麦黄叶死苗。有的黄叶后连续用药,治而无效。现将这种病害的危险症状、发生特点及防治方法介绍如下。一、危害症状。因低温引起的小麦黄叶、死苗,往往伴随雪霉、赤霉以及纹枯等多种病菌侵染危害,尤以雪腐镰刀菌发生较多,危害较大。这种病害的主要症状是叶片发黄,叶尖干枯,有 There are some areas perennial affected by the year-old low temperature, local wheat yellow leaves dead seedlings appear. Some yellow leaves after continuous medication, treatment and invalid. Now this disease risk symptoms, occurrence characteristics and prevention methods are described below. First, endanger the symptoms. Caused by low temperature yellow leaves of wheat, dead seedlings, often accompanied by snow mildew, Gibberella and wilt and other germs infection hazards, especially snow Fusarium occurrence more harmful. The main symptoms of this disease are yellow leaves, withered leaves, there