How to Manage Pests

Pests in Gardens and Landscapes

Canker stain (Ceratocystis canker)—Ceratocystis fimbriata

The fungus that causes canker stain is unusual in that infection almost always is the result of mechanical injury or wounds caused by people. Canker stain causes sparse foliage and undersized leaves. Rapid decline and death of the entire tree can occur. Discolored, elongated wounds or cankers develop on infected limbs and trunks. Cankers may be sunken or covered with bark that is off-colored or flaky. Infected cambium, phloem, and sapwood tissue darkens.

Solutions

Avoid wounding trees; don't nick shallow roots with mowers. Fungal spores readily spread on tools or equipment from one tree to another and are able to infect only fresh wounds. Tool sterilants found effective for fire blight can be used to reduce spread of canker stain. To prevent spreading pathogens on infected tools, clean off debris after each use and thoroughly spray them with disinfectant or soak them in disinfectant for 1 minute or more. Tools can be sterilized using a household bleach or commercial disinfectant as directed on the product label.

London plane tree
London plane tree killed by canker stain

 


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/GARDEN/PLANTS/DISEASES/cankerstain.html revised: January 8, 2014. Contact webmaster.