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Filtering by: Subject Western larch -- Diseases and pests -- Washington (State) Creator Gara, Robert I.

The analysis of the spatial attack pattern of an endemic Douglas-fir beetle population

Creator:

Hedden, Roy L., Gara, Robert I., U.S. International Biological Program. Coniferous Forest Biome, and University of Washington

Abstract:

The attack spatial pattern of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins was shown to be regular within a given subarea of bark on its host, Pseudotsugae menziesii (Mirb.) Franco. Empirical arguments were advanced which indicated the uniform spacing of attacks was the result of a beetle controlled spacing mechanism dependent...

Resource Type:

Technical Report

Full Text:

has been documented for several species (Barris and Perry 1971, Livingston and Berryman 1972). Since
The analysis of the attack distribution of an endemic Douglas-fir beetle population

Creator:

Hedden, Roy L., Gara, Robert I., U.S. International Biological Program. Coniferous Forest Biome, and University of Washington

Abstract:

Felled second-growth Douglas-fir trees in western Washington were used to determine the attack distribution and develop a sampling technique for an endemic Douglas-fir beetle, Dendroctonue peeudotaugae Hopk. (Coleoptera: Scolytidae) population. The attack density varied by circumferential position. The lowest density was on the upper bole and the highest on one...

Resource Type:

Technical Report

Full Text:

western Washington were used to determine the attack distribution and develop a sampling technique for an