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vol.21 número4INFLUÊNCIA DOS FATORES AMBIENTAIS NO COMPONENTE ARBÓREO DE FRAGMENTOS FLORESTAIS EM SÃO FRANCISCO DE PAULA - RIO GRANDE DO SULREINDUÇÃO DA TOLERÂNCIA À DESSECAÇÃO EM SEMENTES DE Bauhinia forficata LINK (FABACEAE) índice de autoresíndice de assuntospesquisa de artigos
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CERNE

versão impressa ISSN 0104-7760versão On-line ISSN 2317-6342

Resumo

PAES, Juarez Benigno et al. EFFECTS OF EXTRACTIVES AND DENSITY ON NATURAL RESISTANCE OF WOODS TO TERMITE Nasutitermes corniger. CERNE [online]. 2015, vol.21, n.4, pp.569-578. ISSN 0104-7760.  http://dx.doi.org/10.1590/01047760201521041849.

The evaluation of the natural resistance of wood to wood-destroying organisms is of fundamental importance in the choice of species to be used in buildings and furniture industry. Thus, the effects of extractives and wood density on biological resistance of Acacia mangium, Casuarina equisetifolia, Corymbia torelliana, Eucalyptus cloeziana, Tectona grandis andCaesalpinia echinata woods to the xylophagous termiteNasutitermes corniger was evaluated under laboratory conditions. Test samples, with dimensions of 2.00 x 2.54 x 0.64 cm (radial x tangential x longitudinal) in four positions in pith-bark direction (internal heart, intermediate heart, outer heart and sapwood) were taken. The woods were exposed to termite action for 28 days in no-choice feeding test. The samples not selected for the termite test were turned into sawdust and the extractive contents were obtained using the shavings that passed through the sieve of 40 and were retained in the sieve of 60 mesh. The wood natural resistance, within the pith-bark positions, for the studied species, is not correlated with the density and extractive content. However, among the woods, those with higher density and extractive content are more resistant. The woods with greater biological resistance to the termite Nasutitermes corniger(smaller mass loss, waste and survival time of insects) are Corymbia torelliana and Caesalpinia echinata and of less resistance is Casuarina equisetifolia.

Palavras-chave : Subterranean termites; Natural durability; Biological assay.

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