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白粉病是长期困扰切花月季生产的病害。其病原是蔷薇单丝壳菌(Powdery muldew,病原菌为Sphaerotheca pannosa Lev.Var.Rosae Wor),病原寄主是蔷薇和月季。陆地栽培,病因主要取决于季节变化引起的温度和湿度变化;在大棚和温室内栽培周年均可发生。白粉病在春秋季发病比较严重,7～8月可形成再浸染过程,基本可以按照菌丝体→侵染叶片→发病→形成孢子的顺序反复侵染植株。一般室温在5℃以上,相对湿度25%以上就可发生危害,但温度超过30℃会受到抑制。低温、高湿、透光性差和闷热窝风时发病更严重。发病症状白粉病的病原首先侵染植株的幼叶、花梗、花蕾等幼嫩部位,发病开始时出现白色粉末状霉点,随着病情的加重,白色霉
Powdery mildew is a disease that has long plagued the production of cut flowers and roses. The pathogen is Romycetes monocytogenes (Powdery muldew, the pathogen is Sphaerotheca pannosa Lev. Var. Rosae Wor) and the pathogen hosts are rose and rose. Terrestrial cultivation, the etiology depends mainly on seasonal changes caused by changes in temperature and humidity; greenhouse and greenhouse cultivation anniversary can occur. Powdery mildew is more serious in spring and autumn, and can be re-infiltrated from July to August. Basically, it can be repeatedly inoculated according to the order of mycelium → infected leaf → onset → sporulation. General room temperature above 5 ℃, relative humidity above 25% can be harmful, but the temperature exceeds 30 ℃ will be inhibited. Low temperature, high humidity, poor light transmission and hot nest when the wind is more serious. Morphological symptoms of powdery mildew first infected plant young leaves, pedicels, buds and other tender parts, the onset of white powdery mildew point appears, with the aggravation of disease, white mold