Stumbled over. Seedlings can be damaged before they are unearthed, causing seeds, germs or cotyledons to rot. After the seedlings were unearthed, the water-stained yellow-brown lesions on the base of the young stems near the ground spread around the stems, which seemed to be hot, and then the stems collapsed into a line, and the seedlings fell to the ground. After the disease occurs, the cotyledons tend to remain green in the short term, while the root epidermis rots brown. In the high-humidity seedbed or even the rainy weather, only the individual seedlings showed symptoms. After a few days, the diseased plants were rapidly spread around the center, causing large seedlings to collapse. When the air is humid, the white flocculent layer may appear on the surface of the diseased seed or the soil and is different from the blight.
Blight. Seedlings can be harmed after they are unearthed, especially in the middle and late stages. The base of the diseased seed became brown, and the diseased part contracted finely, and the stems and leaves succumbed to death. In the early stage of the disease, the disease was wilted and recovered at night. The lesions are initially elliptical dark brown, with concentric circles and pale brown spider silk mold, and the formation of sclerotia in the later stage, is another important feature distinguishing from the disease.
Roots. In the seedlings (behind the seedling stage or after planting), no new roots were found in the roots, and the surface of the young roots was initially rust brown and then rotted, causing the upper leaves to turn yellow. Severe wilting and death, extremely easy to pull up.
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