Symptoms This disease is also known as Brown Vein disease. Leaf spot round or nearly round, ranging in size, light brown, dark brown to purple-brown edges, and some are now concentric ring lines, spots dense black spots, when the lesions are dense and commissure of plaque, disease Part of the leaves dry. Control methods (1) Pay attention to field hygiene. Collect the sickness deeply or burn it in the growing season at the time of harvest. (2) Carry out the crop rotation seriously. (3) Reasonable dense planting, good management of water and fertilizer, method of reference lotus root spoilage disease. (4) Combining the prevention and treatment of lotus root spoilage disease and the treatment of the disease by both spraying and curing the disease.
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