Candeia oil efficiency in improving wood resistance to decay fungi

Juarez Benigno  Paes; Murilo Bortoline Wanderley; Camila da Silva; Fabrício Gomes Gonçalves; Flávia Maria Silva Brito; Glaucileide  Ferreira

doi:10.1590/1983-21252025v3812554rc

Authors

Juarez Benigno Paes Department of Forestry and Wood Sciences, Universidade Federal do Espírito Santo, Jerônimo Monteiro, ES, Brazil https://orcid.org/0000-0003-4776-4246
Murilo Bortoline Wanderley Department of Forestry and Wood Sciences, Universidade Federal do Espírito Santo, Jerônimo Monteiro, ES, Brazil https://orcid.org/0009-0000-4938-0188
Camila da Silva Department of Chemical Engineering, Universidade Estadual de Maringá, Umuarama, PR, Brazil https://orcid.org/0000-0002-7989-7046
Fabrício Gomes Gonçalves Department of Forestry and Wood Sciences, Universidade Federal do Espírito Santo, Jerônimo Monteiro, ES, Brazil https://orcid.org/0000-0003-2010-9508
Flávia Maria Silva Brito Postgraduate Program in Forestry Sciences, Universidade Federal do Espírito Santo, Jerônimo Monteiro, ES, Brazil https://orcid.org/0000-0002-6834-8666
Glaucileide Ferreira Postgraduate Program in Forestry Sciences, Universidade Federal do Espírito Santo, Jerônimo Monteiro, ES, Brazil https://orcid.org/0000-0001-8428-7173

DOI:

https://doi.org/10.1590/1983-21252025v3812554rc

Keywords:

Biological assays. Natural products. Wood protection.

Abstract

World demand for wood products and the shortage of good quality lumber species are exerting pressure on native forests. This study aimed to evaluate the efficiency of Eremanthus erythropappus crude oil in improving the resistance of Pinus taeda wood to Rhodonia (≈Postia) placenta, Gloeophyllum trabeum, Neolentinus lepideus (brown rot) and Pycnoporus sanguineus (white rot) in accelerated laboratory decay tests. Test samples measured 1.90 × 1.90 × 1.90 cm. Oil was applied to wood surfaces using a brush to obtain nominal retentions of 15, 30, 45, and 60 kg of oil per m³ of wood. After treatment, the samples reached average retentions of 16.25, 28.75, 41.50, and 53.75 kg m^-3, respectively, and were submitted to a soil block decay test (accelerated decay test) for 12 weeks. Increased oil retention caused a decline in the mass loss of Pinus taeda wood exposed to the fungi tested. A retention of 16.25 kg m^-3 inhibited Rhodonia placenta degradation and prevented other xylophagous fungi attacks. The most severe decay occurred with Rhodonia placenta and the least with Pycnoporus sanguineus. Oil improved Pinus taeda resistance to the decay fungi, indicating that it is useful for treating wood in contact with domestic animals and humans, since it is not toxic to them.

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