小麦褐斑病,国内尚无报导。我省于1972、1973二年分别在诺木洪农场,本院小麦品种圃内发现,个别品系受害严重,使90％的麦苗枯死或不能抽穗。国外,在日本、美国、加拿大、苏联等国家都有发生。一、症状小麦出苗后就受害。症状从基部开始向上发展。病斑先呈水渍状针头大小的小点,然后逐渐扩大,形成1～3毫米的梭形斑点。病斑中央灰白色,周围黑褐色。病斑可以相 Wheat brown spot, there is no report in China. In 1972 and 1973, two provinces in our province were found in Nuomuhong Farm and in our wheat variety nursery. Individual strains were severely damaged, causing 90% of the wheat seedlings to die or not to be heading. Abroad, in Japan, the United States, Canada, the Soviet Union and other countries have occurred. First, the symptoms of wheat after the emergence of victims. Symptoms start from the basics. The lesion first showed a small spot of water-like needle size, and then gradually expanded to form a fusiform spot of 1 to 3 mm. Central lesion gray, dark brown around. Lesions can be phase