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Nigeria has diverse natural vegetation and some indigenous plant species have been reported to have insecticidal activities. This study evaluated the larvicidal activity of extracts from six Nigerian plant species (Zanthoxylum zanthoxyloides, Piper guineense, Nicotianat abacum, Erythrophleum suaveoleus, Jatropha curcas and Petiveria alliacea) against laboratory-bred Anopheles gambiae and Aedes aegypti larvae. Zanthoxylum zanthoxyloides extract was the most toxic against An. Gambiae larvae with 24h LC50 value of 0.985 g/L. This was followed by P. guineense with 24h LC50 value of 2.185 g/L and N. tabacum, 3.786 g/L while P. alliacea was the least toxic with 24h LC50 value of 22.613 g/L. Zanthoxylum zanthoxyloides extract was also the most toxic for Ae. aegypti larvae with 24h LC50 value of 2.084 g/L. This was followed by P. guineense, 4.378 g/L and N. tabacum, 15.059 g/L while P. alliacea was also the least toxic. Actellic, which was used as the standard synthetic larvicide in this study, was significantly (p |
