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立枯病是山里红苗期的一种主要病害.我省各山楂育苗地区普遍发生,受害较重.幼苗发病后多萎蔫枯死,个别苗圃甚至全部毁灭.症状 立枯病菌由于侵染部位不同,在幼苗上表现为猝倒和立枯两种症状.病菌多从表层上浸染幼苗根部和茎基部,受害部位下陷缢缩,呈深褐色.如幼苗刚出土,组织幼嫩时感病,则为猝倒症状.子叶失水呈灰绿
Rhizoctonia solani is one of the main diseases in the seedling stage.In general, hawthorn nursery areas in our province are harmed and seriously affected.When the seedlings are morbid, they are wilted, and even some nurseries are destroyed completely. Seedlings showed cataplexy and standing withered two symptoms .Bacteria mostly from the surface of the seedling root and stem base disseminated, the victim site subsidence, shrinking, dark brown.If the seedlings just unearthed, tender when the organization is susceptible, then the sudden Inverted symptoms. Cotyledons dehydration was gray-green