Koichi Nishimoto

Effect of Timber Species on the Performance of Anti-Sapstain Chemicals in Controlling Mold and Sapstain Fungi on Wood

Three formulations were evaluated, using 7 timber species, for their effectiveness in Controlling fungal development on wood by partly modified Standard Japan Wood Preserving Association procedure. Effect of timber species on the efficacy of the formulations was obviously demonstrated when wood specimens were brushed evenly at a rate of 160g/m, then inoculated with monocultures of 5 test fungi and incubated at 26 °C for 4 weeks. Best performance was generally produced in Cryptomeria japonica D. Don and followed by the other 4 softwoods such äs Pinus sylvestris Linn., Tsuga heterophylla Sarg., etc. The worst effectiveness of the formulations was always obtained with Shorea sp. or Fagus crenata Blume. A new anti-sapstain chemical, containing 4-chlorophenyl-3-iodopropagyl formal and 2-(4-thiazolyl)benzimidazole, proved more effective than the trichlorophenol-based and amended trichlorophenol commercial products, and competitive in cost efficiency at the indicated treating strengths.