Symptoms: The lesions develop on the abaxial surface of the leaves, with pale yellow to yellow spots appearing on the front of the leaves. Afterwards, they are gradually browned and the lesions are enlarged. The back of the leaves has white bulge-like ecchymosis, nearly round or elliptic to irregular, sometimes healing. The larger the freckle, the later freckle ruptured the white incompetent sporangia. When the leaves are seriously injured, the lesions are dense, the sick leaves are deformed, and the leaves fall off. Control points: (1) Use disease-free seeds or seed dressing with 0.3% seed weight of Rhizoctonia Mn-Zn. (2) The disease is confined to infestation of convolvulaceae vegetables. After a 2-3 year rotation, the disease prevention effect is good. (3) Pay attention to the row of soil in the field and ventilate the plants. (4) spraying 48% metalaxyl MnZn WP, 40% methemosweet WP, or 64% antivirus WP 600 times, 72.2% Procog 800X in the initial stage of disease, Once every 7-10 days, control 2-3 times in a row. Wenzhou Borun Technology Co. Ltd , https://www.alliedbiosolutions.com