How to prevent and cure the common diseases of lotus root?

How to prevent and cure the common diseases of lotus root? The common diseases of lotus root are: first, lotus root brown spot: it is a common leaf disease of lotus root, which produces light brown spots on the leaves and makes the diseased leaves dry up locally. Control methods: reasonable close planting to ensure ventilation and light in the lotus root field; appropriate application of phosphorus and potassium fertilizer to improve plant disease resistance; timely removal of diseased plant residues to prevent the spread of the disease. In the early stage of the disease, spray with 1000 times of 25% carbendazim or 75% chlorothalonil in time. Second, lotus root black spot disease: also known as brown streak, only occurs on the leaves, serious disease spots converge, leaves withered and yellow. Control methods: remove the residual leaves of diseased plants in the field in winter and burn them centrally. In the early stage of the disease, the diseased leaves were removed in time, and sprayed with 1000-fold solution of 70% methyl topiramate, 65% Dysen zinc, or 1 160 Bordeaux solution, generally sprayed every 10 to 15 days, 2 times in a row. Third, lotus root rot disease: also known as Fusarium wilt, mainly harmful to underground stems, aboveground leaves can also occur. When the disease is serious, the whole field is burning. Prevention and control methods: (1) agricultural control. At present, reasonable rotation is the most effective method to prevent and cure this disease, and the rotation cycle is generally 2-3 years. Attention should be paid to selecting healthy plants as seed lotus roots from disease-free lotus root fields to prevent the spread of disease. Reasonable fertilization, no partial application of nitrogen fertilizer, enhance plant disease resistance. (2) Pesticide control. Before planting, spray the seeds with 1000 times of methyl topiramate or 75% chlorothalonil, cover the agricultural film for 24 hours, dry and plant. At the initial stage of the disease, use 0.5 kg of 75% chlorothalonil, add 30 kg of soil, mix well and sprinkle it into a shallow paddy field, or use 50% carbendazim wettable powder 600 × 800 times, 50% topazin wettable powder 800 times, spray every 7 to 10 days, even spray 2 times 3 times, all have a certain effect. Click to see more lotus root planting techniques click to see more vegetable planting techniques