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Ambrosia beetle (Gnathotrichus materiarius)
Photo credit: Pest and Diseases Image Library, Bugwood.org

Galleries made by Gnathotrichus materiarius in pine wood with coloration due to associated fungi.
Photo credit: Louis-Michel Nageleisen, Département de la Santé des Forêts, Bugwood.org

Redbay ambrosia beetle (Xyleborus glabratus).
Photo credit: Michael C. Thomas, Florida Department of Agriculture and Consumer Services, Bugwood.org

Tubes of frass created by the redbay ambrosia beetle on redbay (Persea borbonia).
Photo credit: James Johnson, Georgia Forestry Commission, Bugwood.org

Common ambrosia beetle (Platypus parallelus).
Photo credit: Pest and Diseases Image Library, Bugwood.org

Damage by pinhole borer (Platypus sp.).
Note the presence of dark stain on or round tunnel walls and the absence of powder within the tunnels.
Photo credit: USDA Forest Service Archive, USDA Forest Service, Bugwood.org

Black twig borer (Xylosandrus compactus).
Photo credit: Michael C. Thomas, Florida Department of Agriculture and Consumer Services, Bugwood.org

Damage caused by black twig borers   (Xylosandrus compactus) on Leyland cypress.
Photo credit: Andrew J. Boone, South Carolina Forestry Commission, Bugwood.org