The "trap-log" method to survey the distribution of Armillariamellea in forest soils

Abstract
A technique using trembling aspen [Populus tremuloides] logs was tested to detect and study Armillaria mellea in the soil of a young lodgepole pine [Pinus contorta] stand. A total of 121 sharpened trembling aspen logs were pounded into the ground 1 m apart in a 10 .times. 10 m grid. Evidence of colonization by A. mellea appeared in 31 logs. A map was drawn to show relationships of colonized logs to diseased and healthy trees as well as to stumps within the plot. Eight distinctive patches were found within the plot. Isolates from positive "trap logs" and diseased trees were found to be the same biological species of the A. mellea complex.

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