(1) Bacterial damage symptoms. Blight is not only harmful to seedlings, but also can harm large seedlings. Diseases generally come later than damping-off. They mostly occur in the middle and late stages of nursery. They are characterized by oval-shaped dark brown lesions on the stem base of the affected seedlings, with burrs. The diseased seedlings in the early stage were wilt during the day and recovered at night, and the lesions gradually became hollow. When the humidity is high, a brownish spider silk mold is produced, but it is not obvious and the diseased part does not have white cotton wool mold. This is different from damping-off disease. After gradually expanding the lesion around the stem one week, and even exposed wood, the diseased part of the final contraction dry, wilting leaves can not restore the original state, the seedlings are not plentiful, gradually dry and dead.
(2) The knock-down hazard symptoms. After the seedlings were killed, the base of the stems became immersed in water (like hot water) and quickly turned into a yellow-brown color. At this time, the diseased part contracted linearly, often due to a sudden onset, and the cotyledon was not yet withered. We call catastrophe. Can cause seedlings to fall flat.
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