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Tanzania Journal of Health Research
Health User's Trust Fund (HRUTF)
ISSN: 1821-6404
Vol. 11, No. 4, 2009, pp. 235-249
Bioline Code: th09040
Full paper language: English
Document type: Short Communication
Document available free of charge

Tanzania Journal of Health Research, Vol. 11, No. 4, 2009, pp. 235-249

 en Larvicidal efficacy of seed oils of Pterocarpus santalinoides check for this species in other resources and Tropical Manihot species against Aedes aegypti and effects on aquatic fauna
Adeleke, M.A.; Popoola, S.A.; Agbaje, W.B.; Adewale, B.; Adeoye, M.D. & Jimoh, W.A.

Abstract

Botanical larvicides have featured prominently as alternative to synthetic chemical insecticides which are less degradable and toxic to non-target organisms. The larvicidal potentials of the seed oils of Pterocarpus santalinoides check for this species in other resources and Tropical Manihot species (TMS 30572) were investigated in the laboratory against larvae of Aedes aegypti check for this species in other resources . The seed oil of each plant was extracted using nhexane and was graded into different concentrations; 30, 60, 90, 120 and 150ppm. The toxicity of each of the concentrations was evaluated against 3rd instar larvae of A. aegypti and tadpoles (Buffo spp) as non target aquatic fauna. Both oils were toxic to the larvae though at higher concentrations (120ppm and 150ppm) after 24 hours of exposure. The oil of P. santalinoides was more toxic to the larvae (LC50 104.0ppm and LC90 184.5ppm) than oil of TMS (LC50 113.5 and LC90 201.2) but the difference in the lethal doses was not statistically significant (P>0.05). However, mortality was not recorded at any of the graded concentrations in both oils against tadpoles. The results therefore suggest that the seed oils of both plants could be incorporated as botanical insecticides against mosquito vectors with high safety to non- target organisms.

Keywords
larvicide, Pterocarpus santalinoides, Tropical Manihot, Aedes aegypti

 
© Copyright 2009 Tanzania Journal of Health Research.

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