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Mortality and Damage to Pacific Silver Fir by the Balsam Woolly Aphid in Southwestern Washington

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The balsam woolly aphid (Chermes piceae Ratz.) was shown to be a serious pest of Pacific silver fir (Abies amabilis [Dougl.] Forbes) in the Pacific Northwest. The degree of damage was greatest on dominant and co-dominant trees growing on the best sites. The relative site index was related to the number of trees with stem infestations which in turn was related to the percent of dead trees in the stand and the general crown condition. Recommendations are given for minimizing losses from this important forest pest by the use of a penalty rating system.

Document Type: Journal Article

Affiliations: Entomologist, Division of Forest Insect Research, Pacific Northwest Forest and Range Expt. Sta., Forest Service, U. S. Dept. Agric., Portland, Ore.

Publication date: November 1, 1963

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.
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