PATHOLOGICAL CONDITION OF IMMATURE BALSAM FIR STANDS OF HYLOCOMIUM-OXALIS TYPE IN THE LAURENTIDE PARK, QUEBEC

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Abstract
The pathological condition of fully stocked immature balsam fir stands was investigated in the Hylocomium-Oxalis forest type in the Laurentide Park. Phacidium infestons Karst. was the only foliage disease associated with severe defoliation of trees of all crown classes in 6- to 15-year-old stands. Other foliage diseases were responsible for severe defoliation of intermediate and suppressed trees in stands as old as 45 years. Decays of trunks, butts, and roots were present in all stands, including stands of the 6- to 15-year age class. Fungi associated with trunk rots entered mainly through broken trunks and scars. The principal wood-destroying fungus causing trunk decays was Stereum sanguinolentum Alb. and Schw. ex Fr. Fungi associated with root and butt rots of dominant and codominant trees entered mainly through injuries caused by larvae of Hylobius pinicola Couper. This is the first time that H. pinicola has been associated with infection courts of wood-destroying fungi. Injuries of undetermined nature were the principal infection courts of fungi causing root and butt rots of intermediate and suppressed trees. Corticium galactinum (Fr.) Burt was the most frequently isolated Basidiomycete from root and butt rots.

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