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灰霉病病苗色浅,叶片、叶柄发病呈灰白色,水渍状,组织软化至腐烂,高湿时表面生有灰霉。幼茎多在叶柄基部初生不规则水浸斑,很快变软腐烂、缢缩或折倒,最后病苗腐烂枯死。灰霉病病菌主要在土壤中越冬。病菌耐低温,7~20℃大量产生孢子,经气流、浇水和农事操作等传播。苗期棚内温度15~23℃,弱光,相对湿度90%以上或幼苗表面有水膜时最易发病。如遇连阴雨或寒流大风天气,放风不及时、密度过大、幼苗徒长,分苗移栽时伤
Botrytis cinerea light color, leaves, petiole disease was gray, water-like, tissue softening to decay, wet surface when gray mold. Young stems and petioles at the base of more irregular infiltration of newborn spot, quickly become soft rot, shrink or fold down, and finally died of disease decay. Botrytis cinerea prevails in the soil. Bacteria resistant to low temperature, 7-20 ℃ large number of spores produced, the air flow, watering and farming operations and other dissemination. Seedling greenhouse temperature 15 ~ 23 ℃, low light, relative humidity of 90% or more when the water surface membrane seedlings most susceptible to disease. In case of rainy or cold windy weather, the wind is not timely, the density is too large, the seedling is long, when the seedlings transplanted injury