In order to develop long term performance data on the ability of pressure treated wood currently being produced in Canada to resist termite attack, a test plot has been established at Kincardine, Ontario in an area of known termite activity. This particular location, where termites were first reported in 1954, was selected after an extensive evaluation of potential test sites in southwestern Ontario. Material for evaluation in the test plot was either supplied directly by the wood treating industry or purchased at local lumber retailers. This material consisted of incised and non-incised commodities, ie: 2x4 (50x150mm), 2x6 (50x150mm), 4x4 (100x100mm) and 6x6(150x150mm), of four species (red pine, jack pine, lodgepole pine, eastern spruce) treated with either copper chrome arsenate (CCA-C) or ammoniacal copper arsenate (ACA) preservatives to the requirements of the CSA 080 Wood Presevation standard. Some additional PWF grade pressure treated plywood and a number of untreated controls were also installed. Treatment penetration and assay retention determinations were carried out on all test material prior to installation in the test plot. After one year in service, almost half of the untreated controls showed signs of attack, indicating extensive termite foraging activity in the test plot area. While most of the pressure treated material was rated as sound, there were several individual pieces that showed superficial signs of termite attack. However, all of this particular material was known to be very poorly treated. In a separate test at the site, commercial copper naphthenate field cut preservative was found to be very effective in protecting untreated wood surfaces from termite attack.