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IPM Scouting in Stone Fruits

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Powdery mildew of cherry - Podosphaera clandestine (Wallr.:Fr.) Lév.
IPM scouting in stone fruits > powdery mildew of cherry
On tart cherry, mildew appears first as circular, white, felt-like patches on young leaves. Spreading rapidly, it eventually engulfs entire leaves.

Small, brown to black, spherical bodies (cleisto-thecia) appear in the felt-like patches as the season progresses. Severely in-fected leaves exhibit upward rolling, becoming stiff and brittle with age. Mildew on green fruit appears as shiny, red blotches often with white fungal growth in the center.

Fruit infections are rare in the eastern U.S. Mildew is favored by dry summers with intermittent periods of high humidity and moisture. 
Powdery mildew of cherry
Mildew on fruit leaves.
Additional information
Images on this page provided by Alan L. Jones.

This information was developed from A Pocket Guide for IPM Scouting in Stone Fruits by David Epstein, Larry J. Gut, Alan L. Jones and Kimberly Maxson-Stein. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2840).
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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Updated 7/24/07