Crude and column chromatographic fractions of methanol leaf extract of Jatropha curcas were tested for their larvicidal activities against laboratory reared late third instar larvae of Anopheles arabiensis. Crude methanol leaf extract of J .curcas had similar larvicidal activity to 0.5 ppm Temephos (positive control) at test concentrations ranging from 125 -1000 ppm while column chromatographic fractions (F 1 and F 2 ) of the crude methanol leaf extract of J.curcas showed similar larvicidal activities to 0.5 ppm Temephos at 62.5 and 125 ppm test concentrations. Column chromatographic fraction three ( . Thus, the larvicidal activity of crude methanol leaf extract was not due to the synergistic effects of its fractions. Further studies are recommended to identify larvicidal active ingredients from the active column chromatographic fractions of crude methanol leaf extract of J. curcas.
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