Dissemination of Hymenomycetes byDendroctonus pseudotsugae(Coleoptera: Scolytidae)

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Abstract
Isolations of Hymenomycetes on semiselective media were attempted from preflight, in-flight and postflight Douglas-fir beetles (DFB), D. pseudotsugae. Eighty adult DFB either removed or allowed to emerge from Douglas-fir bolts (preflight) yielded no Hymenomycete; 178 of 222 DFB collected in flight yielded at least 1 Hymenomycete: Fomitopsis pinicola from 169; Cryptoporus volvatus (often obscured by the faster growing F. pinicola) from 5; and other Hymenomycetes (less important in sapwood decay) from 31. Basidiospores acquired during the flight period, rather than dikaryotic mycelial fragments, are hypothesized as the propagules disseminated, since most of these isolates were without clamps (monokaryotic). Of 122 postflight adults removed from egg-laying galleries, F. pinicola was isolated from 5 and C. volvatus from 1. Many of the propagules were detached in moist phloem during tunneling. These DFB-vectored propagules may be significant in the enhanced sapwood decay noted in trees attacked by DFB.

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