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trees killed by Douglas-fir beetle

trees killed by Douglas-fir beetle

Local or regional scale disturbances such as storms, fire, or defoliator outbreaks provide an abundance of newly dead or highly stressed Douglas-fir trees—the preferred breeding site for the Douglas-fir beetle (Dendroctonus pseudotsugae). In such outbreaks, D. pseudotsugae populations increase and kill large numbers of nearby healthy, live trees over several years. Shown here is a group of mature Douglas-fir trees killed by the Douglas-fir beetle in the Blue Mountains of northeastern Oregon, USA, during an outbreak in the early 1990s (Photo by Darrell Ross, Ph.D.)

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