Occurrence of Fungi Antagonistic to Poria weirii in a Douglas-Fir Forest Soil in Western Oregon
Five fungi isolated from forest soil--Trichoderma viride, Pestalotia sp., Gliomastix chartarum, Cephalosporium acremonium, and what appears to be a mutant of Penicillium humuli--were consistently antagonistic to Poria weirii on malt agar as were a few other miscellaneous isolates. Total fungus colonies on soil-dilution plates fluctuated seasonally in response to changes in soil moisture content but did not appear to be correlated with other measured values of soil organic content or pH. Soil temperature, from U.S. Weather Bureau records for Corvallis, varied inversely with fungus populations. Principal antagonists comprised only about 6.7 percent of all fungi counted over the 2-year period of sampling.
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Document Type: Journal Article
Affiliations: Plant Pathologist, Pacific Northwest Forest and Range Experiment Station, Forestry Sciences Laboratory, Forest Service, U. S. Dept. Agric., Corvallis, Oregon.
Publication date: 1969-03-01
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