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IPM Scouting in Stone Fruits

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Armillaria root rot - Armillaria spp.
IPM scouting in stone fruits > armillaria root rot
In Michigan, armillaria root rot is common in Montmorency tart cherry orchards located on sandy, well-drained soils. Affected trees may exhibit poor growth for one or two years and then die suddenly in mid- to late summer. The disease spreads out from a central area of one or two initially infected trees. Clusters of honey-colored mushrooms may arise at the bases of dead trees in late August or September.
Armillaria root rot Armillaria root rot
A thick, white, fan-shaped fungal mat is often present between the necrotic inner bark and the wood of the tree’s crown (left). Armil-laria is distinguished from other fungi by its dark brown to black, shoestring-like structures called rhizomorphs (right).
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