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|Title: ||Pesticidal Potential of the Leaves of Ocimum Casilicum linn. and Hyptis spicigera lam. on Callosobruchus maculatus F. (cowpea weevils) family lamiaceae|
|Authors: ||Olotu, Paul N.|
Chindo, Istifanus Y.
Gushit, John S.
Ohemu, Temitayo L.
Ior, Lydia D.
Wannang, Noel N.
Mmuo, Marian I.
Onche., Emma U.
|Issue Date: ||2013|
|Publisher: ||Journal of Natural Product and Plant Resources|
|Series/Report no.: ||Vol. 3;No. 5; Pp 31-35|
|Abstract: ||A laboratory study was conducted on the pesticidal potentials of the aromatic plants Ocimum basilicum Linn and Hyptis spicigera Lamarck both of the family Lamiaceae against Callosobruchus maculatus (cowpea weevils), a pest
of stored cowpeas. The essential oils produced by these plants which are a complex mixture of terpenes, sesquiterpenes, their oxygenated derivatives and other aromatic compounds were obtained by steam or hydro/hot-distillation method using a soxhlet extractor. 70g portions of Ocimum basilicum and Hyptis spicigera powdered leaves were separately extracted sequentially using the solvents; Hexane, ethylacetate, acetone, methanol and water in order of increasing polarities. Phytochemical screening of the both plant leaves showed the presence of alkaloids, cardiac glycosides, in all the extracts; flavournoids, tannins, steroids and carbohydrates in most of the extracts; while saponins and anthraquinones tested virtually absent. The extracts of both plants were tested for pesticidal activity against untreated cowpea seeds using cowpea weevils. Within the experimental time of 24-72hrs
using 100mg and 200mg of 100mg/ml concentration, the solvent extracts generally demonstrated a knock down and
mortality activity. Hexane extracts showed 80% mortality and 66.67% knockdown while acetone extracts showed 75% mortality and 60%knockdown. The effects were significant for both plants at P>0.05. Both plants exhibited an increase in effect with increasing concentration of the extracts.|
|ISSN: ||2231 – 3184|
|Appears in Collections:||Pharmacognosy and Traditional Medicine|
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