Estimating the total extent of Phellinusweirii root rot centers using above- and below-ground disease indicators

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Abstract
The reliability of aboveground indicators, mycelium on the root collar and stain–decay on the stump surface as estimators of the total number of Phellinuswėirii diseased trees and the total area within root rot centers was examined in 25- to 60-year-old Douglas-fir stands.Although variation occurred among stands, aboveground indicators provided a reliable estimate of the total number of diseased trees and of the affected area. Recognizing only trees with aboveground indicators accounted for half the total number of diseased trees and half the diseased area in stands 45 to 60 years of age and half the number and two-thirds the area in 25- to 30-year-old stands. By also including trees with root collar mycelium and (or) stain–decay on the stump surface, a further 25 to 30% of the infected trees and infection area were recorded. However, the reliability of estimating the total number and area was not significantly improved; consequently, the time spent in uncovering and recording the occurrence of mycelium on the collar or stain–decay on the stump surface could not be justified.

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