Evaluation of some wood extractives and related compounds as anti borer anti fungal and anti termitic agents

Bultman, J.D.; Parrish, K.K.

International Biodeterioration Bulletin 15(1): 19-27


Accession: 005401815

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A review of Wood's natural resistance to various wood-destroying organisms is presented. Phytochemical examination of these resistant woods is being made to isolate and identify the constituents which confer protection and to determine their effect upon the physiology of the target organisms. Dalbergia retusa (cocobolo) yielded a quinonemethide, obtusaquinone, which prevented shell formation by metamorphosing teredinid pediveligers. Structural alteration of obtusaquinone yielded a series of quinonemethide analogs, cinnamylphenols and benzylphenols. Except for the benzylphenols, it was necessary for the molecular structures of these compounds to include a cinnamyl moiety and 2 O atoms mutually ortho on the quinoid (or the phenolic) ring to be effective against teredinids. A di-t-butylbenzylphenol was very effective against teredinids and pholads. Obtusaquinone inhibited the growth and reproduction of Chaetomium olivaceum and Pestalotia oxanthi. Obtusastyrene from D. obtusa was effective in retarding the vegetative growth of both organisms and inhibiting the reproduction of Chaetomium. Lapachol from Tabebuia gyayacan was ineffective as an anti-borer agent. Obtusaquinone, obtusastyrene and lapachol were effective anti-termitics, protecting pine from Coptotermes formosanus and Reticulitermes virginicus.