EFFICIENCY OF NATURAL WOOD EXTRACTIVES AS WOOD

A. Syofuna, A.Y. Banana, G. Nakabonge

Abstract


Wood extractives play a major role in the protection of wood against termite and fungal attack.
Wood extractives from three hard wood species of Milicia excelsa, Albizia coriaria and Markhamia
lutea that are known to be very resistant against termite attack and fungal decay were studied to
assess their role as wood preservatives in Uganda. Acetone, hexane and distilled water were used
in the extraction of these compounds from the outer heartwood of the selected durable species.
Extraction was done using a soxhlet extractor. e extractives obtained were used to treat Pinus
caribaea and Antiaris toxicaria species known to be susceptible to termites and fungal attack. Treated
blocks were then exposed to Macrotermes bellicosus termites in the eld. It was observed that wood
extracts used as preservatives improved the resistance of less durable samples to termite attack by
50% compared to the controls. It was also observed that removal of extractives decreased resistance
of the durable samples. It can be concluded that wood extractives contribute greatly to the protection
of less durable wood species against termite attack.

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