山东省平菇产区,每年8月至翌年3月是集中投料发菌的生产阶段,发菌的成败,直接与产量、效益密切相关。这期间,病害的侵染危害及防治,就成为菇农十分关心的问题。现已发现济阳县有的乡村菇农在发菌期间平菇患了水霉菌病。现将其危害症状及防治方法介绍如下。一、危害症状水霉菌病主要发生在平菇的发菌期,可引起培养料内平菇菌丝消退,直至绝产。此菌显微镜下观察,有分枝发达的丝状体,无隔膜,菌丝粗而长,呈节状,可见游动的孢子。棉籽壳水浸作平板培养水霉菌,其菌丝初为淡白色,粗壮,很稀疏的网状交织,25℃左右培养15天后结成网被,呈桔黄色。平菇发菌期间危害症状:发菌初期,培养料面长出淡白色稀疏的菌丝层,随菌丝层加厚及孢子囊大量形成,颜色 Shandong Province, mushroom production area, every year from August to March the following year is the focus of feeding bacteria production stage, the success or failure of germs, directly with the yield and benefits are closely related. During this period, the damage of the disease and its prevention and control have become very concerned with mushroom farmers. It has been found that some village mushrooms in Jiyang County, during mushroom growth mushroom suffering from fungal water disease. Now its harmful symptoms and prevention methods are described below. First, endanger the symptoms Water fungal disease occurs mainly in the fungus mushroom period, can cause the culture material Pleurotus mycelia subsided until the abortion. Microscopic observation of this bacteria under the microscope, a well-developed filamentous body, no diaphragm, thick and long mycelium, was nodular, visible swimming spores. Cottonseed shell water immersion plate cultivation of water mold fungi, its hyphae early pale white, sturdy, very sparse mesh intertwined, cultured at 25 ℃ for about 15 days to form a net was orange color. Mushroom damage symptoms during the period: the beginning of hair germination, the training material grow pale white sparse mycelium, thickened with mycelium and sporangia mass formation, color