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Lesson 5Lesson 5

Edge Modification Study - Treatment Effectiveness

Results of Chuck Rowan’s Edge Modification Study in Coastal BC
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  • Compared to damage in controls, pruned, topped, and feathered treatment units had 30–50% less wind damage during the first winter after treatment.
  • Treatment units with combined feathering plus crown modification had 65% less damage than untreated controls.
  • For the blocks with more than one year of post-treatment measurements, the majority of damage occurred during the first winter. There is a slight increase in standing tree mortality in the fourth year after treatment in some of the pruned/topped treatment units.
  • Untreated trees in the pruned and topped treatment units are more vulnerable than treated trees of similar size in these units.
  • In the control units – slender trees were more vulnerable, trees with rotten branches or mistletoe were more vulnerable.
  • Stands with a higher amabilis fir component were more vulnerable than stands with a higher cedar component.
  • Only 30% of new leaners blew down over the second winter.
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