Effect of Seed Methanol Extracts from Prosopisafricana, Pentaclethramacrophlla and Erythrophleumsuaveolens on Termites Infestation of Some Common Wood Species
DOI: https://doi.org/10.33003/jobasr-2023-v1i1-19
Ekhuemelo D. O.
Markdoh K. A.
Tembe E.T.1
Abstract
The aim of this study was to investigate termicidal properties of seeds of three
tropical trees species. Methanol extracts of P. africana, P. macrophylla, and of
E. suaveolens seeds were prepared and applied on three common wood species
viz: FicussppDaniella oliveri and Vitellariaparadoxa.The treated wood sample
was buried to a depth of 10 cm for graveyard experiment for a period of 5
months. Spacing was 3 m between holes and 3 m between replicates. Result on
percentage extract retention indicated that E. suaveolens extract displayed
varying absorption percentages across wood species, with differences observed
in D. oliveri and V. paradoxa woods treated with Solignum compared to
extracts. Higher extract concentrations correlated with increased absorption. V.
paradoxahad the highest mean percentage absorption (31.50%) and retention
(31.50%) and was recorded for Solignum. Solignum. treatment wood showed
comparatively lower (8.02% - 14.22%), weight loss percentages suggesting
potential efficacy in mitigating termite-induced damage. Untreated wood
samples exhibited significantly higher (46.07% - 58.65%) weight loss
percentages, indicating vulnerability to termite infestation. Highest
Concentration (1.5 g) of E.suaveolens seed methanol extract had moderately low
weight of 15.14% ± 9.87% (D. oliveri), 19.36% ± 11.98% (V. paradoxa), and
20.19% ± 7.04% (Ficus spp.). Also, 1.5 g concentration of P.macrophylla seed
methanol extract had modest weight loss of 12.60% ± 6.78% for D. oliveri;
21.00% ± 12.87% for V. paradoxa and 21.56% ± 16.40% for Ficus spp. In
conclusion, 1.5 g concentration of seed methanol extract was relatively the most
active and it is recommended for wood treatment against termites.The most
susceptible wood species to termite attack was Ficusspp and it should be
properly treated before employed in service.
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