Abstract: Compositions for preventing or inhibiting the infection of wood raw materials by fungi causing sapstain, superficial mold and decay comprising a mixture of a dithiocarbamate, an alkali metal borate, and a selected antioxidant stabilizing agent. The mixtures exhibit a synergistic fungicidal activity and have the advantage over known anti-stain wood-preservative compounds that they are stable, relatively non-toxic and water-soluble. The compositions may be formulated as a dry formulation, as a solution or as a gel and may also include an alkaline salt or a gelling agent.