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50 trees/site 57-B Spaced aerial surveys Alliford Bay sites attributed to hemlock Bay on Moresby branch samples British Columbia budworm and hemlock caused by blackheaded Cooley spruce gall Creek on Graham crown thirds Cumulative mean current defoliation damage appraisal sites dead tops dead trees defoliation mapped defoliation occurred defoliation on regenerating defoliation was recorded egg densities Graham Island grey areas Grey trees Ground surveys hemlock sawfly infested spruce Jl 185 Spaced Juskatla Inlet King Creek Koot light defoliation live crown 100 Louise Island mapped during aerial Marie Lake mean length Moresby Island National Park Reserve/Haida Park Reserve/Haida Heritage percentage of trees Phantom and King Phantom Cr planted Douglas-fir Queen Charlotte City Queen Charlotte Islands regenerating western hemlock Sandspit second consecutive severe defoliation Sitka spruce Skidegate small area spruce gall adelgid Stand opening number stripped top study plots Tsuga Turnquist unspaced stands Visible defoliation Western Forest Products Weyerhaeuser and Western