Abstract
The causes of the exceptionally low natural durability of one individual plantation-grown teak tree from Panama were investigated. In durability tests with Coriolus versicolor (Leithoff et al. 2001) the heartwood of this tree had shown a mass loss between 32% und 43% while the reference material of a durable teak from Myanmar revealed only 2.3% up to 12.1% mass losses. Further studies on the antifungal effects of extractives of this specimen have been performed and the results compared with those of durable teak woods from the same plantation and from natural forests in Myanmar as well. As highest antifungal activity was found in the acetone/water extract, this extract will be analysed here in relation to the inhibitory effect of fractionated substances on mycelium growth of Coriolus versicolor (white rot) and Coniophora puteana (brown rot). In parallel studies Windeisen et al. (2003) surveyed the chemical composition of plantation-grown teakwood from the same origin in Panama.
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