Powdery Mildew Disease

Severe Powdery Mildew Disease on Elm (Ulmus sp.)Powdery mildew is a common fungal disease of angiosperms and is so called because the mycelium of the fungus growing on the leaves, stems and flowers appears as a grayish white powdery coating. Powdery mildew is a disease separate and distinct from downy mildew. Although the signs of both diseases appear similar to the naked eye, powdery mildews are caused by fungi in the order Erysiphales while downy mildews are caused by fungi in the order Peronosporales.

Members of the order Erysiphales are considered obligate parasites of plants because they require a living host to survive. All attempts to grow them on artificial media have failed.


Plant Genera Susceptible to Powdery Mildew Disease
Signs and Symptoms of Powdery Mildew Disease
Methods of Host Infection
Environmental and Host Conditions That Promote Powdery Mildew
Measures for Controlling Powdery Mildew Disease
Key to the Genera of Powdery Mildew Fungi
Technique for Preparing Powdery Mildew Samples for Microscopic Identification
Glossary of Terms
Back to Foliar Diseases of Hardwoods

This page was prepared by Karen Monroe
It was last updated on 30 May 2000
Minor link updates on 31 Jan 2008 by M.J. Munster
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