Mortality and Deterioration of Looper-Killed Hemlock in Western Washington
Abstract:Mortality and deterioration rates of western hemlocks killed in 1963 in western Washington by hemlock looper (Lambdina fiscellaria lugubrosa Hulst.) were similar to those reported more than a decade earlier in British Columbia. Over 60 percent of trees with 70 percent or more of their foliage consumed by the insects died within 3 years. After 2 years 20 percent of the volume of dead standing trees was lost to decay, whereas trees felled while green and left on the ground for 2 years lost only 1 percent.
Document Type: Journal Article
Affiliations: Forest Entomologist, Washington State Dep. of Natural Resources, Olympia
Publication date: March 1, 1970
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