The Relative Tolerances of 18 Wood-Destroying Fungi

Threshold values were measured using ponderosa pine in the agar-block method. Brown rots used in the evaluation were: Lentinus lepideus, Daedalia quercina, Fomes subroseus, Lenzites trabea (2 isolates), L. saepiaria, Poria incrassata, P. monticola (2 isolates), P. vaillantii, P. xantha. White rots used were: Schizophyllum communae, Stereum frustulosum, Polyporus abietinus, P. adustus, P. hirsutus, P. tulipiferae, P. versicolor. Ten preservatives were used at eight levels of retention. The preservatives were: creosote, pentachlorophenol, copper naphthenate, copper-8-quinolinolate, rosin amine-D-pentachlorophenate, phenyl mercuricoleate, chromated zinc chloride (CZC), tenalith (FCAP type), acid copper chromate, and copper pentachlorophenate. Fomes subroseus and Polyporus tulipiferae were unusually tolerant to eight of the ten preservatives tested. Stereum frustulosum was exceptionally tolerant to phenyl mercuricoleate as was Lentinus lepideus to creosote. Poria vaillantii was moderately tolerant to acid cupric chromate and CZC but susceptible to all the other preservatives. Schizophyllum communae was susceptible to all preservatives except creosote, likewise P. abietinus to all except rosin amine-D-pentachlorophenate. The two isolates of L. trabea and P. monticola showed different patterns of resistance to the preservatives. P. monticola, P. incrassata, and Fomes subroseus were all tolerant to copper naphthenate and P. tulipiferae was tolerant to pentachlorophenol.

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