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In an effort to find new preservatives which are less hazardous,
the efficacy of heartwood water extracts of Tectona grandis (teak)
and Piptadeniastrum africanum (dahoma) (0.60 g/ml) were pressure
and non-pressure impregnated into ten Ghanaian selected LUS and
exposed in the field to the ground for 8 months. Visual durability
ratings, hardness and mass losses were measured in assessing their
field performance. Though less used timber species (LUS) retained
dahoma extract more altogether, teak extract improved the
durability of both pressure and non-pressure impregnated LUS more
than that of dahoma did.Durability of LUS pressure impregnated with
teak extract was finally ranked as follows: P. macrocarpus > A.
ferruginea > B. sapida > S. rhinopetala > A.
pterocarpoides > C. zenkeri > C. gigantea > S. oblonga
> A. toxicaria > C. schweinfurthii. Durability of LUS
non-pressure impregnated with teak extract, regardless of
impregnation method, was ranked as follows: S. oblonga > C.
gigantea > C. zenkeri > C. schweinfurthii > A. Toxicaria.
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