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月季白粉病(Sphaerotheca pannosa(wallr)Lev)、蔷薇单丝壳,又名:蔷薇白粉病。除为害月季外,尚为害白玉棠、十姊妹、野蔷薇、山刺玫、阿佛氏蔷薇、大卫蔷薇、西班牙蔷薇、苹果蔷薇和穆氏蔷薇等。据观察,该病除为害月季叶片外,尚可为害其嫩枝梢,使叶片失绿,变成灰黄色,甚至枯焦脱落,枝梢弯曲,乃致枯死;还可为害花萼和花托等,直接影响月季的光合作用、高生长和开花。月季白粉病在温、湿度较高,通风不良时,蔓延迅速,病情严重。它均以分生孢子和粉孢子进行再侵染,以菌丝在寄主休眠芽内越冬。
Sphaerotheca pannosa (wallr) Lev, rose moniliforme, also known as: rose powdery mildew. In addition to damaging the rose, still harm Baiyutang, ten sisters, wild rose, mountain rose, Aphrodite rose, David rose, Spanish rose, apple rose and rose Mu and other. It is observed that the disease in addition to damaging the leaves of the rose, but also harmful to its tender shoots, leaves green, pale yellow, even Kujiao off, shoots bend, is caused to die; but also harmful calyx and torch, etc., direct Affect the photosynthesis of roses, high growth and flowering. Rose powdery mildew in the warm, high humidity, poor ventilation, the rapid spread, the serious condition. It is re-infected with conidia and powder spores, with mycelium wintering in the host dormant bud.