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Comparative Tolerance of the Brown-Rot Fungus Antrodia vaillantii (DC.:Fr.) Ryv. Isolates to Copper

Considerable Variation in copper tolerance was evident when 36 isolates of the brown-rot fungus, Antrodia vaillantii, were grown on malt-extract agar medium supplemented with various concentrations of copper sulphate pentahydrate. While some strains were extremely sensitive to copper and their growth totally inhibited by all test concentrations, others were able to tolerate a maximum concentration of 0.04M. Isolates also responded differently to the same concentration. Due to this Variation, A. vaillantii isolates used for evaluating copper-based formulations need to be selected carefully and any interlaboratory comparisons of wood preservative efficacy should be made using the same strain of fungus.