In summer 2001 we ran one field experiment to test the feasibility of Sylvanex (formerly Cartapip 97) as a biocontrol agent to protect logs from being stained by wild-type bluestain fungi. Freshly felled lodgepole pine logs were spray-treated with Sylvanex, dispersed in water, or with water alone (referred to as non-treated). Sampling of the piles of logs took place after 6 weeks and again after 13 weeks. The bluestained area on discs taken from the logs was measured in the laboratory. The data clearly indicate that Sylvanex can control bluestain in freshly felled lodgepole pine logs if applied immediately after felling to the total log exterior. After six weeks of summer storage, when logs are most vulnerable, Sylvanex-treated logs remained almost spotless compared to heavily stained non-treated logs. After 13 weeks of storage there was moderate stain development in Sylvanex-treated logs but the amount was significantly less than in non-treated logs. The product, and the concept of using albino isolates to control stain, therefore has potential for industrial use. Before Sylvanex is used industrially on a large scale it is recommended that additional studies should investigate whether adjuvants, such as spreaders and stickers, or using higher concentrations of biocontrol agent improve its performance and consistency. In addition the efficacy of the product should be tested on other wood species.