The Influence of Actidione on Wood-Staining Fungi

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Abstract
The influence of Actidione (cycloheximide) upon the growth of 23 wood-staining fungi, including species of Ascocybe, Cadophora, Curvularia, Cytospora, Endoconidiophora, Graphium, Hormiscium, Leptographium, Ophiostoma and Sclerophoma, was studied; 17 species were found relatively insensitive to 100 [mu]g per ml, 6 were sensitive to the antibiotic. Ascocybe grovesii Wells was the most affected, one geographic isolate being completely inhibited by 0.1 [mu]g per ml and another by 1 ug per ml. No increased resistance was observed after 3 successive transfers onto media of low concentration of Actidione with inoculum grown on media containing subinhibitory levels of Actidione. Pentachlorophenol was relatively non-toxic to A. grovesii, for it grew in a medium containing 2% by weight. Ophiostoma picea under the same conditions was completely inhibited by 0.1%. Brick-red stain of conifers, caused by A. grovesii, cannot be controlled with Permatox and the usual dipping method. Although the effect was tested in vitro and not on white pine sapwood, the results indicate the possibility of control with Actidione. Unfortunately, the other staining fungi were much less sensitive to the antibiotic.

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