青海省在诺木洪农场,农林科学院小麦品种圃内发现小麦褐斑病,个别品系受害严重,使90％的麦苗枯死或不能抽穗。日本、美国、加拿大、苏联等国都有发生。国内尚无报导。症状:小麦出苗后受害。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,然后扩大成1—3毫米的梭形斑点。中央灰白色,周围黑褐 Qinghai Province found wheat brown spot in Nuomuhong Farm, Academy of Agriculture and Forestry, and severely affected individual lines, making 90% of the wheat seedlings dead or unable to produce heading. Japan, the United States, Canada, the Soviet Union and other countries have occurred. There is no domestic report. Symptoms: Victims of wheat emergence. Symptoms start from the basics. The lesion first presents a small, water-like needle-like size and then expands to 1-3 mm fusiform spots. Central gray, dark brown around