A shipping trial was done to determine the fungicidal efficacy of the sapstain control products PP523 or F2 applied using the Electrodyn or an hydraulic/electrostatic (H/E) spray system, in comparison to the performance of a conventional hydraulic spray treatment of NP-1. Test packages of treated lumber, as well as untreated controls, were stored at Vancouver, B.C., and at Tampa, Florida. The packages were opened and rated for growth of fungi at 4.5 and 11 months.