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猝倒病常发生在蔬菜幼苗期。自幼苗茎基部向上发生湿腐,致使幼苗倒伏,叶片却不凋萎。倒伏后的幼苗逐渐干枯收缩成一条线。有时湿腐没有继续发展,形成一段凹陷,即缢缩。土壤潮湿时,遗留在地面的死苗上可长出棉絮状白霉。严重时未等幼苗出土,便发生霉烂,引起烂种,造成缺苗。猝倒病是土传真菌病害,种子也能带菌。育苗时床土低温潮湿,空气温度变化大,光照不足,常发生此病。保护地育苗通风不及时,
Dumping disease often occurs in vegetable seedlings. Wet seedlings stem up from the base of the stem, resulting in seedling lodging, but did not wilt leaves. After lodging the seedlings gradually dry shrink into a line. Sometimes wet rot did not continue to develop, forming a depression, that shrink. Moist soil, left on the ground dead seedlings can grow cottony white mold. In severe cases unearthed young seedlings, they occur rotten, causing rotten species, resulting in lack of seedlings. Dust off disease is soil-borne diseases, the seeds can carry bacteria. Bed soil temperature and humidity when nursery, air temperature changes, lack of light, often the disease. Protected nursery ventilation is not timely,