Degree of discoloration by two Ophiostoma species in wounds in Douglas-fir trees

The rate of discoloration of Douglas-fir sapwood by two Ophiostoma species introduced through bark wounds was assessed in three separate trials over a 1-year period. Discoloration was most rapid in the longitudinal direction, reflecting the ability of the fungi to grow readily along the tracheids. Growth was more rapid in the radial than tangential direction, again reflecting the presence of more pathways for fungal ingress (i.e., the rays). The discoloration occupied 6 to 9 percent of the total section area 39 to 40 days after fungal inoculation illustrating the potential for fungal damage with prolonged log storage. Implications of this discoloration on log storage are discussed.

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