How does planting lotus root prevent brown spot disease?

How to prevent and cure brown spot by planting lotus root? Please give an introduction to planting lotus root can refer to the following methods to control brown spot: first, symptoms. The disease mainly harms the leaves and petioles of lotus root. The leaves have small brown-green spots at the beginning of the disease, and then expand into reddish brown to dark brown irregular to polygonal necrotic spots, with yellow halos on the periphery, the size of 2-10 mm, the disease spots often have concentric patterns, and in the later stage, the disease spots often converge into large patches that turn brown and dry. If the petiole is susceptible, it is easy to break and sag. When the air humidity is high, the surface of the disease spot will produce a gray-brown sparse mildew layer. Second, the law of the disease. The pathogen overwinters with the diseased and disabled tissue. When the temperature and humidity are suitable, conidia are produced and primary infection is formed. Conidia reinfection occurs after the onset of the disease. Third, prevention and control methods. ⑴ agricultural control: combined with cutting stubble before winter, thoroughly clean up the old leaves, concentrate comminution and retting fertilizer, reduce the source of bacteria in the field; strengthen fertilizer and water management, increase the application of phosphorus, potassium and zinc fertilizer, timely and moderately drain the field, promote root growth and enhance plant disease resistance. ⑵ chemical control: at the initial stage of the disease, you can choose 50% dimethrin wettable powder 500x liquid or 40% Fuxing EC 5000 times liquid, or you can also use 70% methyl thiophanate wettable powder 600x liquid or 40% isoprazin wettable powder 600x liquid spray, spray once in 7-15 days, 2-4 times in a row. Click to get more lotus root planting techniques click to get more vegetable planting techniques