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番茄早春育苗常遇上低温、光照少和阴雨天气,易发生猝倒病和早疫病。这两种病是番茄早春育苗常见的主要病害,严重时使整个苗床出现“倒苗”。猝倒病。病首先在近地面的茎部出现水渍状,后渐溢缩凹陷。开始时病苗白天蔫萎,晚上恢复正常,两三天后病部呈暗褐色而折倒。在高温高湿下,病部生有白色棉絮状霉层,以致腐烂。在播种过密,又没有及时间苗,床温低于15℃,连续阴雨天、突然转晴升温的情况
Early spring nursery tomatoes often encounter low temperature, light and rainy weather, prone to damping-off disease and early blight. These two diseases are the common main diseases of tomato early spring nursery, when serious, make the whole seedbed appear “inverted seedlings.” Damp down disease. The disease first appeared in the surface of the stem near the water-like, after the gradual depression. At the beginning of the disease, the plantlets wilt during the day and return to normal at night. After two or three days, the diseased part turns dark brown and collapses. Under high temperature and high humidity, the sick part has a white cottony mildew layer that causes decay. Sowing too close, there is no time and seedlings, bed temperature is below 15 ℃, continuous rainy days, suddenly sunny clear warming situation