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Table: Diagnosis and Control of Eutypella Canker
Pest Identification Host Plants Damage Symptoms
Eutypella Canker of Maple
Eutypella parasitica
Maples (sugar, red, and Norway). Cankers of maple do not usually affect the foliage of the tree, but may cause the tree to fail (fall over) during strong winds. The canker causes a target shaped lesion on the main stem usually below 9 feet, however, the canker may begin on an infected branch. Eventually black perithecia are formed in the center of the canker. In addition, mycelial fans may be seen under the bark near the margin of the canker.
Monitoring Control Options Pesticides
Maple trees should be monitored for cankers so that cankered trees can be evaluated as hazard trees. There are no control options other than to remove hazard trees, and plant other species in heavily infected areas. None
Description and Life History
Description: Eutypella is a fungal canker that infects the main stem and branches of trees. This fungus produces spores on black colored perithecia.

Life history: Fungal spores produced in perithecia are dispersed to healthy trees by rain splash and wind. These spores enter the tree through wounds that penetrate the cambium layer. After infection the canker expands for approximately one year until a layer of callus forms. This callus layer is then breached and the fungus continues to grow until another callus layer is formed. This results in a target shaped canker. Old cankers will form black perithecia.

Overwintering: The fungus overwinters in the infected wood of the tree.


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Last modified on March 06, 2013