Chapman, J. A., and E. D. A. Dyer. 1969b. Cross attraction between the Douglas-fir beetle (Dendroctonus pseudotsugae Hopk) and the spruce beetle (D obesus Mann) . Canada Department of Forestry, Entomology and Pathology Branch, Bi-monthly Research Notes 25:31.
Chapman & Dyer 1969
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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