The efficacy of benomyl, thiophanate-methyl and pentachlorophenol in reducing sapstain in logs of <i>Pinus sylvestris* 1 and <i>Picae abies</i> was tested in field trials in Finland during 1977-81. The effects of the fungicides varied between years and with the time of year when applied. Treatment usually decreased sapstain, though no complete long-lasting protection was gained. Tables show the fungi isolated from treated and untreated logs. -- AATA