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Inoculum Reduction Measures to Control Armillaria Root Disease in a Severely Infested Stand of Ponderosa Pine in South-Central Washington: 20 Year Results

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A stand of ponderosa pine (Pinus ponderosa) severely impacted by Armillaria root disease was treated with five different levels of sanitation by root removal in an attempt to reduce losses to root disease in the regenerating stand. Treatments included: (1) Trees pushed out, maximum removal of roots by machine, visible remaining roots picked out by hand; (2) Trees pushed out, maximum removal of roots by machine; (3) Trees pushed out, no further removal of roots; (4) Trees pushed out, large stumps left, otherwise maximum removal of roots by machine; (5) Clear logged, sod scalped between the stumps, stumps retained. After 20 yr there was a general reduction in mortality with improved sanitation, although treatment #3 was less effective than expected. In each type of stand regeneration (thinned, unthinned, and planted), only treatment #1 consistently expressed less mortality than the other treatments, and differences were significant in the thinned and unthinned portions of the experiment between treatments #1 and #5. Crop tree height and diameter growth after 20 yr were also best in treatment #1. These results do not necessarily indicate that push-over logging is ineffective, but rather they show that after trees and intact stumps have been pushed out, further cleaning is needed to reach the satisfactory sanitation level achieved in treatment #1. Hand cleaning as done in treatment #1 would certainly be cost prohibitive, but perhaps that level of root removal could be achieved in light textured soils with judicious use of a land-clearing brush rake. West. J. Appl. For. 15(2):92-100.
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Document Type: Journal Article

Affiliations: Champion International Corp., Glenwood, WA 98619

Publication date: 2000-04-01

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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 Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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