Stumble down. Before the seedlings emerge, they can suffer damage, causing the seeds, germs or cotyledons to rot. After the affected seedlings were unearthed, they were stained with water-stained yellowish-brown spots on the base of the young shoots near the ground. They spread around the stems and seemed to be hot and hot. The diseased stems then contracted into a line and the seedlings fell to the ground. After the onset of the disease, the cotyledons often remain green without wilting in the short term, while the roots of the roots rot brown. In high-moisture seedbeds or even rainy days, only individual seedlings begin to exhibit symptoms, and after a few days, the diseased plants spread rapidly around the center, causing large seedlings to stumble. When the air is wet, a white flocculent layer may appear on the surface of the diseased seedlings or soil, which is different from blight. Blight. The seedlings can be damaged after unearthing, especially in the middle and later stages. The base of the diseased seedlings became brown, and the posterior diseased part shrank and the stems and leaves wilted and died. Slightly diseased seedlings are wilted during the early days and recover at night. At the beginning of the lesion, the lesion was dark brown with an oval shape, with concentric ring and light brown spider silk mold. The later formation of sclerotia was another important feature that distinguished from damping-off. Roots. Seedlings (at the nursery stage or after planting) do not produce new roots. The larvae appear rust-brown at first and then rot, resulting in yellowing of the upper leaves. Severe wilting and death, easy to pull up
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Major diseases of vegetables during seedling stage
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