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IPM Scouting in Stone Fruits

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Crown gall - Agrobacterium tumefaciens (E.F. Smith & Townsend) Conn
IPM scouting in stone fruits > crown gall
Crown gall on rootstock
Crown gall on Mazzard F12/1 rootstock.
Tumors or galls are produced on the roots and crown and, under special circumstances, on aboveground portions of plants. Galls begin as small, smooth growths that enlarge to become dark, hard, woody tumors with gnarled, irregular surfaces. Old galls may be covered with secondary fungi and riddled by insects. Orchard trees with one or more large galls on the crown are often stunted.
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