Fungi Toxocity of Pentachlorophenol Having Reduced Impurities

No significant differences were found between the fungi toxicities of a commercial pentachlorophenol and one in which the impurities (hexa- and octachlorodibenzo-p-dioxins) commonly found in commercial pentachlorophenols were reduced. Bioassays were made with brown-rot, white-rot, mold, and sapstain fungi, and the index of fungitoxicity was taken as the inhibition of fungal growth around paper disks treated with the two chemicals. The two formulations appeared about equally effective in protecting wood against fungi. The brown rots had lower tolerances to pentachlorophenol than did the white rots. One isolate of the white rot fungus Polyporus tulipiferae (Madison 517) showed a high tolerance to pentachlorophenol and might be considered as a standard assay organism for this chemical.

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