John F. Dendroctonus adjunctus Blandford D. The range of this forest pest extends from southern Utah and Colorado southward through pine forests to Guatemala. Study of a serious outbreak in southern New Mexico showed the insect to have a 1-year life cycle.
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The roundheaded pine beetle, Dendroctonus adjunctus , is an important bark beetle that attacks and kills various species of pines from Nevada, Utah, and Colorado south to Guatemala. In the Southwestern United States its primary host is ponderosa pine, Pinus ponderosa. It often occurs in trees in conjunction with the western pine beetle, Dendroctonus brevicomis , and pine engravers of the genus Ips.
Like other tree-killing bark beetles, the roundheaded pine beetle causes tree mortality by feeding and developing in the phloem of the tree. Utilization of the phloem for habitat and nourishment results in girdling of the tree so that translocation of nutrients is impeded. The insect also inoculates attacked trees with blue-stain fungi Ophiostoma adjuncti and Leptographium pyrinum , but the ecological role of these in helping the insect kill the tree or providing nutritional benefits to the insect is unclear.
EPPO Global Database
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Livingston, W. Bedard, A. Mangini, H. Ponderosa pines baited with the synthetic attractants exo-brevicomin and frontalin plus host resin were successfully attacked by Dendroctonus adjunctus Blandford.