Occurrence and Prevention of Common Diseases of Lotus Root

First, lotus root brown spot: It is a common leaf disease in lotus root, which produces pale brown spots on the leaves and leaves the diseased leaves partially dry.

Control methods: a reasonable close planting to ensure ventilation and light in Putian; appropriate application of phosphorus, potassium fertilizer, improve plant disease resistance; timely removal of diseased plant residues to prevent disease spread. At the early stage of disease, spray with 25% carbendazim 600 times or 75% chlorothalonil 1000 times.

Second, lotus root black spot disease: also known as brown streaks, only occurs on the leaves, when the lesions meet, leaves yellow.

Control methods: In the winter, the residual leaves of field plants are removed and burned. In the early stage of disease, the diseased leaves are removed timely and treated with 70% thiophanate-methyl 1000-fold, 65% dexamethasone 600-fold, or 1:1:160-200 Bordeaux-based spray. Generally, they are sprayed every 10-15 days. Spray 2 or 3 times.

Third, lotus root spoilage disease: also known as wilt disease, mainly damage the underground stem, some parts of the ground can also be disease. When the disease is serious, the whole field is burning.

Control methods: (1) Agricultural control. Rational rotation is currently the most effective way to prevent and treat this disease. The rotation cycle is generally 2 to 3 years. Pay attention to the selection of a healthy plant from a disease-free field to prevent colonization. Rational fertilization, without partial nitrogen fertilizer, enhance plant disease resistance. (2) Chemical control. Before planting, the plants were sprayed with 70% thiophanate-methyl 1000-fold or 75% chlorothalonil 800-fold, and the cover film was sealed for 24 hours and allowed to air dry before planting. In the early stage of disease, use 75% chlorothalonil 0.5 kg, 30 kg of soil, mix well and pour in shallow water, or use 50% carbendazim WP 600 to 800 times, 50% thiophanate WP 800 ~ 1000 times liquid, spray once every 7 to 10 days, even spray 2 to 3 times, have a certain effect.

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