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  FORESTRY SYMPOSIUM 1996
ATTACK OF WOOD DESTROYING INSECTS ON EIGHT COMMERCIAL TIMBER SPECIES IN SRI LANKA

N S De Silva and H S Amarasekara
University of Sri Jayewardenepura

The relative susceptibility of hardwood of Jak (Artocarpus heterophyllus), Eucalypts (Eucalyptus grandis) , Rubber (Hevea brasiliensis), Tualang (Koompassia excelsa), Lunumidilla ( Melia dubia), Pine (Pinus caribaea), Mahogany (Swietenia macrophylla) and Teak ( Tectona grandis) to insect attack was studied by introducing subterranean termites (Odontotermes redemanni), Powder-post beetle (Heterobostrychus brunnes) , and Longhorn beetle (Batocera rubus). Graveyard trials were carried out to study termite attack under natural conditions for a period of six months. Laboratory tests were carried out to study the attack of termites as well as other insects. Highest weight loss was recorded for Rubber due to termites feeding, significantly less than for Teak, Eucalypts, Tualang and Jak. Reduced feeding was accompanied by higher termite mortality. Powder-post beetle completely abstained from feeding Eucalypts, Jak and Teak indicating high resistant of these species, and survivals were not recorded for these species. But the highest weight loss was recorded for Mahogany. The Batocera rubus larvae fed on freshly felled timber. Jak was highly susceptible to Batocera attack. Timber species were ranked according to the results recorded in the series of experiments. Eucalypts was the most resistant species followed by Teak, Tualang and Jak. They are recommended to use for construction, exterior joinery and furniture. Rubber was the susceptible species which can be recommended for use after treatment.

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Department of Forestry and Environmental Science,
University of Sri Jayewardenepura,Sri Lanka. 1999. All rights reserved.