Effect of suppression and felling on infection of oak and Scots pine by Armillaria

Armillaria mellea, A. ostoyae and A. bulbosa, but not A. tabescens, infected some of the heavily suppressed oaks that had been inoculated, whereas only A. mellea infected subdominant oaks. The same three species also infected suppressed Scots pines, but only A. ostoyae infected subdominant ones. Infections in stump roots of oak inoculated with A. mellea, A. ostoyae, A. bulbosa and A. tabescens were small unless roots had been weakened by severing; intact stump roots of pine were colonized more extensively than those of oak by the first three species.