Tagetes erecta Linn. and its mosquitocidal potency against Culex quinquefasciatus
Asian Pacific Journal of Tropical Biomedicine
;
(12): 186-188, 2011.
Article
Dans Anglais
| WPRIM
| ID: wpr-335045
ABSTRACT
<p><b>OBJECTIVE</b>To investigate mosquitocidal effects of ethanolic extract of flowers of Tagetes erecta (T. erecta) and its chloroform and petroleum ether soluble fractions against the larvae of Culex quinquefasciatus (Cx. quinquefasciatus).</p><p><b>METHODS</b>The fresh flowers of T. erecta were extracted in cold with ethanol (5.0 L) and after concentration, the ethanol extract was fractionated with chloroform and petroleum ether to afford a brownish syrupy suspension of ethanol extract (50.0 g), petroleum ether soluble fraction (18.6 g) and chloroform soluble fraction (23.8 g). The larvicidal effect of ethanol extract and their solvent fractions were determined by the standard procedure of WHO against different instars of Cx. quinquefasciatus.</p><p><b>RESULTS</b>Among the tested samples the chloroform soluble fractions showed the highest toxicity and consequently, the lowest LC50 values (14.14 µg/mL, 17.06 µg/mL, 36.88 µg/mL and 75.48 µg/mL) for all the instars larvae of Cx. quinquefasciatus. The larvae showed comparative tolerance in the course of increasing age and time.</p><p><b>CONCLUSIONS</b>It can be concluded that the flowers of T. erecta are very effective natural larvicide and could be useful against Cx. quinquefasciatus.</p>
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Pharmacologie
/
Extraits de plantes
/
Chimie
/
Culex
/
Tests de sensibilité parasitaire
/
Tagetes
/
Fleurs
/
Insecticides
/
Dose létale 50
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Asian Pacific Journal of Tropical Biomedicine
Année:
2011
Type:
Article
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