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菱菌核病菱菌核病又称菱角纹枯病、菱角瘟、白烂病,在长江以南7~9月份的高温雨季发病重。菱菌核病从菱盘形成期至盛花期均可发生,主要危害叶片,水中的“菊状叶”或浮出水面的出水叶均可受害。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。病部可见菌丝缠绕和由菌丝纠结形成的小菌核(典型症状)。防治方法发病初期,可选用50%异菌脲悬浮剂1000倍液,或50%多菌灵可湿性粉剂600倍液、50%菌核净可湿性粉
Gramineae sclerotinia Sclerotinia, also known as water chestnut Rhizoctonia, Brassica, white rot disease, 7 to September in the south of the Yangtze River in the hot monsoon onset. Gramineous sclerotinia can occur from the formation of the spindle to full flowering stage, the main hazard leaves, water, “daisy leaves” or surface water leaves can suffer. Lesions presented at the beginning of a small number of yellow spots on the leaves, after the increase and expansion of leaf spot nearly round or oval, and gradually expanded to amorphous, brown. Sick mycelium can be seen winding and formed by the mycelium of small sclerotia (typical symptoms). Prevention and treatment of the early stages of the disease, the choice of 50% of the ivermectin suspension 1000 times, or 50% carbendazim WP 600 times, 50% sclerotium net WP