Due to the current interest of the preservation industry in the performance of commodities with an envelope of preservative treatment, most of the work in 1988-89 was directed towards evaluation of existing long term commodity tests. Thus unincised decking, incised lumber, landscape ties, siding, and field cut preservative tests were evaluated. The unincised CCA-treated decking had remained sound after 7 years in test whereas the untreated decking had failed due to decay. With regard to the incised lumber in soil contact, it is too early to compare the performance of needle incised and conventionally incised lumber. However, the similar performance of untreated white spruce and lodgepole pine heartwood is of current interest to pressure treaters concerned about the natural durability of wood species available for treating. There was no visual evidence of decay in the hemlock and Douglas fir mini-ties at the western laboratory or in the red pine and aspen minities at the eastern laboratory after 2 years exposure. There was, however, a higher level of microbial activity in poorly penetrated Douglas fir mini-ties than in better treated hemlock mini-ties with exposed cut ends. End-cut preservative treatment effectively prevented this microbial activity.