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The effect of wood extracts as antitermitic agents has been investigated in two Malaysian timber species, namely  Madhuca utilis  (bitis) and  Neobalanocarpus heimii  (chengal). The samples taken from Perak State Forest Reserve felled trees with the age of 38 and 45 years old, respectively. The composition of the extracts were analysed by GC-MS. In the toluene/EtOH extracts of  M. utilis  19 (bark) and 17 (heartwood, hW) chemical constituents have been identified in total. The dominant compounds in bark were (2Z,6E)-farnesol (44%) and thymol methyl ether (29%) and in hW terpinen-4-ol (38%) and γ-terpinene (16%). The  N. heimii  essential oils contained 16 chemical constituents (8 in bark and 8 in hW) with benzyl carbinol (62%) and benzyl isoamyl ether (34%) for bark and eicosane (C20) (50%) and cyclopentanone (19%) for hW. Higher concentration of extracts from bark and hW of  N. heimii , and from bark of  M. utilis ) gave 100% mortality of 3 rd  instars of  Coptotermes gestroi  Wasmann and 99% for  M. utilis  hW extract. The extracts of both wood species showed promising antitermitic properties against subterranean termites.

holzforschung

Anti-termitic potential of heartwood and bark extract and chemical compounds isolated from  Madhuca utilis  Ridl. H. J. Lam and  Neobalanocarpus heimii  King P. S. Ashton