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菱菌核病又称菱角纹枯病、菱角瘟、白烂病,是菱角主要的病害之一,常造成大面积菱叶腐烂。在长江以南7~9月份的高温雨季发病重。在夏季和初秋,天气闷热、温度高、湿度大时病害容易发生和蔓延,水质污浊时更易发病。连作塘块,地处风口的菱塘,种植过密,偏施过量氮肥,菱株体内游离氨基酸含量高时易染病。一、发病症状菱菌核病主要危害叶片。病斑初呈在叶片上出现少数黄色小斑点,后增多和扩大,叶斑近圆形或椭圆形,后逐渐扩大为不定形,黄褐色,病斑表面具云纹,病健部界限明显,病斑日益扩大或连合,导致叶片腐烂或枯死,以至整个菱盘都烂掉。病部可见菌丝缠绕和由菌丝纠结形成的小菌核(典型症状)。
Gramineous sclerotinis, also known as water chestnut Rhizoctonia, Braillellosis, white rot disease, is one of the main diseases of water chestnut, often resulting in a large area of leaf rot. 7 to September in the south of the Yangtze River in the hot monsoon onset. In summer and early autumn, the weather is hot, the temperature is high, and the humidity is easy to occur and spread when the humidity is high. Lianzuo Tong block, located in the outlet Ling Tong, planting too dense, partial excessive nitrogen fertilizer, Ling plant free amino acid content of high susceptibility to disease. First, the onset symptoms Gramineous nuclear disease is the main hazard leaves. Lesions appear at the beginning of the leaves a small number of small yellow spots, increased and expanded after the leaf spot nearly round or oval, and gradually expanded to amorphous, brown, spot surface with moire, disease Department obvious limitations, Increasing lesion or commissure, leading to decay or dead leaves, as well as the entire Lingpan rot. Sick mycelium can be seen winding and formed by the mycelium of small sclerotia (typical symptoms).