1. Overturning disease: When the seedlings are not unearthed or have just emerged, there are many occurrences, and the incidence of large seedlings is small. The emergence of seedlings without emergence, embryonic and cotyledon rot; emergence of seedling emergence, in the base of the young stem appeared flooding, yellow-brown lesions, followed by shrinking lesions were linear, seedlings dead, lodging. In the seedbed, the onset of individual seedlings began, and after a few days the seedlings were expanded to the surrounding seedlings, eventually causing the seedlings to fall. 2. Blight: The disease occurs at the time when the seedlings have been unearthed and before transplanting, especially in the later stages of the seedlings. At the beginning of the disease, the affected seedlings produce dark brown lesions at the base of stems. The seedlings are wilted during the day and can recover at night and in the morning. In severe cases, the lesions spread around the base of the whole stem, causing the stem base of the seedlings to shrink, and the shoots and leaves in the shoots die, but the diseased shoots do not stand upright. inverted. 3. Botrytis cinerea: Occurs mainly in the late stage of seedlings. The lesions appear light yellow-brown spots on the tip and leaf margins at the beginning of the disease, and then extend to the entire leaf, even young stems and growing points, resulting in the death of the upper end of the entire seedling. The disease occurs from the point to the film. When the temperature and humidity are appropriate, it often causes the seedbed to die. 4. Sclerotinia: Mainly endanger the stems of pepper, sweet pepper, cucumber, watermelon, melon, and other seedlings. In the early stage of disease, the lesions are water-stained and prone to watery rot when expanded, causing seedling lodging and death. 5. Anthracnose: At the onset of the onset cotyledons or leaves produce light brown small round or oval lesions, followed by development of a brown to dark brown lesions, the stems are damaged, resulting in oval strip brown lesions. When the temperature and humidity are appropriate, the young leaves and the growing points of the seedlings will easily die after being killed. 6. Roots: It is a kind of physiological disease. It usually shows that the seedlings will not grow new roots after being unearthed. The roots outside the roots will be rusty brown, decay gradually, the growth of stems and leaves will be inhibited, the leaves will gradually turn yellow, and new leaves will not be made. The diseased seedlings can be easily pulled out of the soil. In severe cases, the diseased plants will wilt and die. The root cause is mainly due to rainy days or heavy snowfall, lack of light, seedbed soil temperature is low, humidity is high, the ability of seedlings to absorb water is hindered.
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