Mortality and Deterioration of Looper-Killed Hemlock in Western Washington
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.
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Document Type: Journal Article
Affiliations: Forest Entomologist, Washington State Dep. of Natural Resources, Olympia
Publication date: 1970-03-01
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