Lotus root disease, also known as black root disease and lotus root, is the first major disease in lotus root production. In general, shallow fields and shallow water in the old paddy fields and continuous cropping fields are susceptible to disease and affect crop production and reduce yield. It is a disease of lotus root which is caused by the infection of cysts and stems. It mainly damages underground stems, aboveground leaves and foliage.
Lotus leaf blight This is the second major disease on lotus roots. The pathogen is the pathogenic fungus of the monocervus genus. The main damage to the lotus leaf, the lotus leaf edge first appears pale yellow lesions, and then gradually spread to the middle of the leaves, yellow-brown, and finally expanded from the leaf marrow to the veins, until the whole leaf withered. High temperature and rainy, favorable disease, insufficient fertility in Putian, serious diseases.
Lotus leaf spot mainly damages the leaves, and sometimes occurs on the petiole, which is caused by the pathogenic fungus of the genus Rodius.
Control methods: Before planting, use 70% thiophanate-methyl 1000-fold or 75% chlorothalonil 800-fold spray to suffocate the plant. The cover film is sealed for 24 hours and allowed to air-dry before planting. In the early stage of disease, 75% chlorothalonil 0.5 kg, 65% dexage 0.5 kg, 30 kg of soil and mix well and throw in shallow water, 70% thiophanate-methyl 1000 times, 65% zeocin 600 Double liquid or 1:1:160-200 Bordeaux spray control, generally every 10-5 days spray once, even spray 2-3 times.
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