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一、为害症状: 1、猝倒病:主要为害黄瓜、辣椒、番茄、茄子、芹菜等幼苗。病苗近地面处的茎基部,先出现似开水烫过样的浅绿色病班,后很快扩大并绕茎一周,病部变黄褐色并缢缩呈线状,致病苗倒折而死。由于病情发展极快,以致当病苗倒折、死亡时,其子叶还未凋萎,而仍保持着鲜绿色。在苗床温度大时,往往在病部可见
First, the symptoms of harm: 1, damping off disease: the main damage cucumber, pepper, tomato, eggplant, celery and other seedlings. Stems near the ground at the base of the stem, the first appeared like boiling water like the kind of light green disease classes, and soon after the expansion and around the stem a week, the Ministry of disease turned yellowish brown and shrinking linear, causing the disease rebel death . Due to the rapid development of the disease, cotyledons have not yet withered and died in bright green when the seedling was folded and died. In the seedbed temperature is often visible in the diseased part