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Abstract
The fungi colonizing Pseudotsuga menziesii (Douglas-fir) sapwood lumber were assessed in samples collected from locations in western Oregon. A total of 547 isolates representing 29 genera and 45 species were obtained from sample boards. Graphium spp. represented 17% of all isolates, and the incidence of these species increased with time after sawing. The addition of streptomycin to malt extract agar improved isolation frequencies, while the addition of cycloheximide sharply limited isolations to Graphium spp. and some Trichoderma isolates. The results indicate that Douglas-fir sapwood is susceptible to colonization by a variety of fungal species. As a result, control strategies that concentrate on one fungus may have limited success because of interference from competing flora.