As part of the eastern field testing program, Forintek Canada Corp. established the first Canadian termite test plot at Kincardine, Ontario in 1988 to address an industry need for performance data on treated wood commodities exposed to attack by the eastern subterranean termite. CCA-C and ACA treated red pine, jack pine, lodgepole pine, eastern spruce and SPF lumber of various dimensions was obtained directly from the wood treating industries or purchased from retail outlets for installation in the test plot. The material represents a wide range of treatment penetrations and assay retentions. After four years in service, the performance of untreated controls shows a continuing high level of termite activity in the main plot area, but a lower level in an annex area. A fairly high incidence of surface grazing was observed on much of the CCA-C treated lumber in the main plot. Although this superficial attack resulted in only cosmetic damage in most cases, there were a number of test pieces in which termites had clearly broken through the treated zone and were attacking untreated wood within the treated shell. Since most of this attack was found on non-incised CCA-C treated lumber with very shallow preservative penetration, this material was considered to be vulnerable to termite attack. Incised CCA-C treated and non-incised ACA treated lumber which came closer to meeting the CSA080 standard for ground contact applications continue to perform well and was considered to be resistant to termite attack. Copper naphthenate field cut preservative was also found to provide good protection againds termite attack.