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United States Department of Agriculture


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https://www.fs.usda.gov/treesearch/content/pdf?name=Verbenone-releasing%20flakes%20protect%20individual%20Pinus%20contorta%20trees%20from%20attack%20by%20Dendroctonus%20ponderosae%20and%20Dendroctonus%20valens%20(Coleoptera:%20Curculionidae,%20Scolytinae)