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1症状侵害小麦幼苗的根及叶鞘和叶片,易发生在有雪覆盖或雪刚刚融化的麦田。病株上初生浅绿色水渍状病斑,布满灰白色松软霉层,后产生大量黑褐色的菌核。病部组织烂腐、病叶极易破碎。2发生规律病菌以菌核随病残体在土壤中生活。秋季土壤湿度适宜时,菌核萌发产生担孢子,借气流传播,从根或根颈及叶和叶鞘处侵入,菌核也可直接萌发产生菌丝进行扩展。病菌生长温限5-15℃,1-5℃时致病力最强。冬季积雪时间长,土壤不结冻,土温0℃左右易发病,
1 Symptoms Invasion Roots and leaf sheaths and leaves of wheat seedlings easily occur in wheat fields that have snow-covered or snow-melted. On the diseased plants pale green water stain-like lesions, covered with gray-white moldy layer, resulting in a large number of dark brown sclerotia. Sick rot of diseased tissue, diseased leaves easily broken. 2 regular bacteria to bacteria with sclerosis living in the soil. When the soil moisture in autumn is appropriate, the sclerotia of the sclerotia produce basidiospores and spread by air flow, invade from roots or roots and leaves and leaf sheaths, and the sclerotia can directly germinate and produce mycelium to expand. Pathogen growth temperature 5-15 ℃, 1-5 ℃ when the strongest pathogenicity. Long winter snow, soil is not frozen, soil temperature 0 ℃ or so prone to disease,