Further Studies on the Effects of Thinning and Harvesting of Conifers on Armillaria ostoyae and Heterobasidion annosum in Oregon, USA : Root and Butt Rots

Uppsala

International Union of Forest Research Organizations, Swedish University of Agricultural Sciences

1994

S. 633-641

9 Lit. Ang.

Bandaufführung

13462

73812

Although thinning and partial harvesting have been used in Oregon, USA, for decades, their effects on root pathogen/host interactions are not well known. Precommercial thinning has been shown to have no significant effect on crop-tree mortality caused by Armillaria ostoyae in several conifer species in central Oregon. Thinning with nitrogen fertilizing significantly decreased the percentage of stem decay caused by Heterobasidion annosum in Abies grandis in southern Oregon. Neither season of harvesting nor stump size significantly affected the amount of stump decay caused by Heterobasidion annosum in Armillaria grandis stumps of trees cut 5 to 10 years earlier in northeastern Oregon.