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Economic Impact of Decay on Black Walnut

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Total volume, volume loss caused by decay, total value, and value loss to decay were determined for 920 black walnut trees during harvest in Nebraska, Iowa, Kansas, Minnesota, and Wisconsin. Sale units (total 37) ranged from 3 to 198 trees. Total volume was 133,000 bf (Doyle); total merchantable volume lost due to decay was 7450 bf, or 6%. Value of trees at the landing if they had had no decay totaled $87,600; value loss caused by decay was $11,235, or 13%. Less than 15% value loss was recorded for 28 sale units, but over 40% for 5 sale units. High levels of decay in a sale unit were often associated with previous livestock grazing, particularly swine. Other factors important in predisposing trees to decay were lightning, flooding, and mechanical injury of an undetermined nature. Guidelines are provided for reducing injuries, decay, and value losses in black walnut. North. J. Appl. For. 3:116-118, Sept. 1986.

Document Type: Journal Article

Affiliations: Davey Environmental Services, RR6, Lincoln, NB 68502

Publication date: September 1, 1986

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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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