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Survey of Black Walnut Canker in Plantations in Five Central States

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A survey was conducted to determine the incidence of an annual stem canker of plantation-grown black walnut in Illinois, Iowa, Minnesota, Missouri, and Wisconsin. Regionwide, walnut canker was observed in 84% of the 183 plantations surveyed, and 9.7% of the 19,340 trees examined were cankered. Canker incidence was significantly higher on bottomland sites (12.2%) than on upland sites (7.2%). Fusarium solani was the Fusarium sp. most frequently isolated from cankers. Regionwide, 30% of the cankers were associated with wounds; pruning wounds were the most frequently observed wounds associated with cankers. Only 1.6% of the cankers were associated with signs of attack by ambrosia beetles. Minimizing wounding may reduce the chances of canker formation. North. J. Appl. For. 10(1):10-13.

Document Type: Journal Article

Affiliations: USDA Forest Service, St. Paul, MN 55108

Publication date: 1993-03-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Northern Journal of Applied Forestry covers northeastern, midwestern, and boreal forests in the United States and Canada.
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