ã€Symptoms】 The disease mainly damages the leaves. The lesions are polygonal and yellow-brown. After the lesions are expanded, they merge into big spots. When the disease is severe, the leaves are covered with lesions, causing the leaves to die and fall off.
ã€Pathogens and Pathogenesis】 The pathogen is Cercosporachionea. The disease usually occurs in July-September, and generally the lower leaves become susceptible and gradually spread upward. Poor growth of plants, heavy onset in the rainy season, pathogens overwintering on diseased plant residues.
ã€Prevention and treatment methods】1 Clear away diseased leaves in the autumn, concentrate burning, and reduce the source of infection in the coming year. 2 When spraying, spray 50% carbendazim WP 700-1000 times, 70% Mancozeb WP 800-1000 times, spray once every 10 days, spray 3-4 times continuously and have good prevention and treatment effect.
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