Abstract
Two isolates of an unidentified basidiomycete (UB) and two isolates of Echinodontiumtinctorium (ET), all from suppressed grand fir (Abiesgrandis (Doug.) Lindl.) in Oregon, were found to have an optimum growth temperature on malt agar medium of about 23 °C. In soil-block decay tests, conducted for 10 months at 23 °C. ET isolates caused average weight losses of 21.9 and 18.1%, while no decay was associated with UB. When UB was inoculated onto blocks precolonized with ET, it had a small negative effect upon the decay capacity of ET. However, when ET was inoculated onto blocks containing either living or dead (steam-sterilized) UB, no decay ensued. The UB isolates had apparently imparted a growth-inhibiting or fungitoxic material into the wood. As a result of this work, prior infection of twigs with UB is believed to inhibit or stop invasion of this infection court by ET.
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