Studies on the antitermitic properties of wood and bark crude extracts of forest species from Central Amazonian, Brazil

In wood preservation, efficiency evaluation of some natural compounds has been going onforsome time, looking for substances that can be used to increase the useful life of wood species, and that are less damaging to the environment. In this context, we evaluted the potential of wood and bark extract...

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Bibliographic Details
Published in:Acta amazonica 2007-06, Vol.37 (2), p.213-218
Main Authors: Barbosa, AP, do Nascimento, CS, de Morais, JW
Format: Article
Language:Portuguese
Subjects:
Amara
Buchenavia
Isoptera
Nasutitermes
Pouteria
Simarouba
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Summary:In wood preservation, efficiency evaluation of some natural compounds has been going onforsome time, looking for substances that can be used to increase the useful life of wood species, and that are less damaging to the environment. In this context, we evaluted the potential of wood and bark extractives of the species Pouteria guianensis, Buchenavia parviflora and Dinzia excelsa in repelling Nasutitermes sp. As substrate, blocks of Simarouba amara species, of low durability, was used. The extractives were obtained in ethanol 95%, diluted in hydro-alcoholic solution (1% and O.1%), and impregnated in a block of S. amara, according to ASTM D1413-76. The blocks were arranged on a platform in Latin square and submitted to termite attack. The effect of the solutions on termites was classified according to weight loss of the S. amara blocks. The results showed that a big majority of extractive treatments provided high resistance to S. amara wood. The best treatment was that made with the P. guianensis bark extractives, where loss was only 10% of the initial block weight. The less effective treatment was that of the D. excelsa bark extractives, with 70% loss of block weight. Thus, we concluded that the wood and bark extractives of P. guianensis and B. parviflora and wood extractives of D. excelsa present chemical compounds with repellent properties against Nasutitermes sp., while the bark extractives of D. excelsa do not.
ISSN:0044-5967