Mortality and Deterioration of Looper-Killed Hemlock in Western Washington

Authors: Johnson, Norman E.; Shea, Keith R.; Johnsey, Richard L.

Source: Journal of Forestry, Volume 68, Number 3, 1 March 1970 , pp. 162-163(2)

Publisher: Society of American Foresters

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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: 1: Forest Entomologist, Washington State Dep. of Natural Resources, Olympia

Publication date: 1970-03-01

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