Diffusion of boron from fused borate rods through selected woods

The ability of boron to diffuse from fused borate rods through the heartwood of 13 wood species and kill decay fungi in the wood was evaluated in small blocks. Because fungi did not completely colonize all blocks of the various wood species, accurate determination of toxic threshold of application for the borate rods was difficult. Boron was detected in every section analyzed, although the levels detected differed substantially among species. Borate penetrated red and white oak least; white fir, Douglas-fir, western hemlock, western larch, and sugar maple were highly penetrable. The other six species were moderately receptive to treatment. Remedial treatments with borate rods appear to be feasible with a majority of the species tested.

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