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Compressive strength in Heartwood Extract of Teak (HWE) treated hardwoods after exposure to white rot attack
Abstract
Wood samples of Triplochiton scleroxylon and Gmelina arborea obtained from Omo Forest Reserve, South West Nigeria were treated with Heartwood Extract of Teak (HWE) and cuprinol-clear. The wood blocks were inoculated with two white rot fungi; Pleurotus squarrosullus and Lentinus subnudus for 12 weeks. Absorption of chemicals were determined at two concentration levels while resistance to decay was tested using Maximum Compressive Strength parallel to grain (MCS//). Data obtained were analyzed using ANOVA and descriptive statistics. Within wood blocks of the same species, absorption of both HWE and cuprinol-clear were not significantly different at both 4% and 8% concentrations. In both preservatives G.arborea test bocks produced higher MCS// than test blocks of T. scleroxylon. HWE was effective in reducing the impact of white rot in Gmelina arborea and Triplochiton scleroxylon.
Keywords: Heartwood extract, Gmelina arborea, Triplochiton scleroxylon, White rot fungi, Compressive strength.
