Annual Spread Rate of Tomentosus Root Disease

摘要: The spread rate of tomentosus root disease, caused by Inonotus tomentosus, was investigated a new technique employing temporal differences in the initiation reduced annual radial increment between pairs diseased trees. Pairs infected trees (stumps) located on periphery disease centers were selected each six widely separated spruce (Picea spp.) stands British Columbia. Distances 12 stumps measured, and disks collected from stump. Similarly, four additional younger stand. Uninfected control for all sites. Tree-ring measurements determined disk samples year which reduction attributable to I. began difference years divided into distance them produced an average 20 cm/yr. This will be used developing model disease.