Japan Wood Preserving Association established a method for testing effectiveness of chemicals against sapstain and mold fungi on wood in 1979. The method is concerned with a laboratory technique using small timber specimens (20 x 50 x 3 mm³), petri dish and 5 test fungi. Effectiveness of each candidate chemical is evaluated on the basis of the relative resistance to sapstain and mold fungi which derives from visual rating of the fungal growth on the treated and untreated wood after 4-week incubation at 26±2°C and 70-80% R.H. Results of commercial trichlorophenol-base product indicated that relatively higher concentrations were required to protect timber satisfactorily from fungal attack in the test, as compared with practical treating concentrations at the sawmills.

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