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发病症状:白粉病是瓜叶菊常见的病害,叶片、枝条、花蕾、嫩芽等部位均可感染。发病初期,被害部位表面长出一层白粉状霉层,边缘不明显,随后逐渐扩大并变为浅灰色,并产生黑色小粒点,植株受害后生长衰弱,花不能正常开放,叶片卷曲皱缩,影响观赏价值,严重时叶片逐渐枯死,甚至整株死亡。发病规律:病原菌以菌丝体在病芽、病叶、病枝上越冬,翌年随新芽的萌发而侵染,并随风力传播。
Symptoms: powdery mildew is a common disease of cineraria, leaves, branches, buds, buds and other parts can be infected. Early onset, the victim site surface layer of white moldy mildew grows, the edge is not obvious, and then gradually expanded and turned into light gray, and produce small black particles, plant growth after the impaired, flower can not be normal open, curly folds , Affecting the ornamental value, when the leaves are getting dying, even the whole plant dies. Pathogenesis: Mycoplasma mycotic disease in disease buds, diseased leaves, sick branches overwinter, the next year with the sprouting of germination and infection, and spread with the wind.