The whole growth period of sunflower sunflower can be affected. When the seedling stage is infected, 2-3 true leaves begin to show symptoms. After the leaves are damaged, chlorotic plaques begin to appear along the leaf veins. If rain or high humidity is encountered, the back of the diseased leaf is visible. Thick white mold layer. However, under conditions of prolonged drought, the mildew layer does not appear even in plants with particularly severe disease. Slow growth of diseased plants, the formation of dwarfing, often withered and gradually withered; adult stage diseased leaves showed varying sizes of chlorotic chlorotic spots, high humidity leaves with white mold layer, a few mild infection The plants can be flowered and seeded, seeds are small and white, or they are not very different from healthy seeds, but the seeds can become carriers of infection in the second year of the year.
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