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近年来,月季白粉病发生较为严重,轻则姿容减色,重则导致枝叶干枯。从而失去观赏价值。一、症状:月季白粉病主要发生在叶片上,重时可蔓廷到叶柄、嫩稍和花蕾上。病斑初为褪绿色黄斑,渐扩大.其上(?)一层白色粉状物。严重时叶片卷曲,叶柄及嫩梢弯曲、节间缩短,芽停止生长,花蕾萎缩枯死。二、发生规律:该病原菌为单丝壳属的一种真菌SPhaerothcapannosa(wallr)Ⅰ病菌的菌丝体在休眠的芽内、病叶、病蕾、病稍上越冬。第二年温湿度适宜时继续发育,并产生大量的分生孢子,随风雨飞扬飘落在嫩叶、嫩稍上萌发
In recent years, the occurrence of powdery mildew is more serious, ranging from the appearance of color, but also lead to dry branches. Thus losing the ornamental value. First, the symptoms: Rose powdery mildew occurs mainly in the leaves, when heavy can be Man Ting Petiole, tender and buds on. The lesion was initially faded green macula, gradually expanding .On it (?) Layer of white powder. Serious curly leaves, petiole and tender tip bending, internodes shortening, buds stop growing, flower buds shrinkage dead. Second, the occurrence of the law: the pathogen is a filamentous genus of a fungus SPhaerothcapannosa (wallr) Ⅰ mycelium in the dormant bud, the diseased leaves, disease Lei, the disease a little overwinter. The second year when the temperature and humidity continue to develop, and produce a large number of conidia, with the wind and rain flying in the young leaves, tender on the germination