Relative tolerance of CCA by larvae and adults of the common shipworm, Bankia gouldi

IRG/WP 92-4174

B R Johnson

Southern pine sapwood "2 x 4´s" were created by bolting together four panels 13 mm thick by 89 mm wide by 457 mm long. The two outer laminates were untreated and the two inner laminates were each treated to different CCA retentions, ranging from 8.0 to 43.2 kg/m³. Test specimens were exposed from May to October in a tributary of the Chesapeake Bay. Larvae were unable to settle on and burrow into the exposed edges of the treated laminates. However, shipworms that initially entered the "2 x 4´s" through untreated laminates were able to continue burrowing into the CCA-treated laminates. This experiment demonstrates the very great difference in tolerance of CCA by larval and adult Bankia gouldi, and illustrates the hazard of allowing even small openings, such as areas of untreated heartwood, for shipworms to enter otherwise well treated wood.


Keywords: BANKI GOULDI; CCA; CHESAPEAKE BAY; ADULT BORERS; LARVAE; MARINE TESTS; RETENTIONS; TEST PANELS; TOLERANCE; USA

Conference: 92-05-10/15 Harrogate, England, UK


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