Wood Decay Inhibition by Tropical Hardwood Extractives and Related Compounds

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Abstract
Pine blocks were impregnated with the extractive obtusaquinone, obtusastyrene or lapachol, or with the synthetic compound 2-benzyl-4,6-di-t-butylphenol. The blocks were sterilized by steam or by exposure to ethylene oxide and then subjected to decay by Gloeophyllum trabeum, Poria placenta or Coriolus versicolor. Obtusastyrene and obtusaquinone were most effective against the brown-rot fungi, controlling them at concentrations of 3 and 3.5%, respectively. Weight losses by C. versicolor were reduced from 23% (steamed blocks)-4% by a 4% concentration of obtusastyrene and to 6% by a similar concentration of obtusaquinone. Lapachol was effective at its highest concentration (4%) only against P. placenta. Benzylphenol, at a similar concentration, reduced all decay-associated weight losses to 8% or below. Ethylene oxide sterilization resulted in decreased decay by G. trabeum and P. placenta on treated wood. In control (nontreated) wood no significant differences in decay susceptibility were detected between blocks sterilized by different methods.

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