Abstract:
The experiments of this study were carried out under laboratory conditions
at the department of plant protection ,College of Agricultural Studies, Sudan
University of Science and Technology (Shambat). The objectives of this study
were to evaluate the effect of hexane and ethanol extracts of Jatropha curcas
seeds and leaves against the third larval instar of culex quinquefasciatus
mosquitoes, main vector of filarial elephantiasis.
The comparative dosage-generated mortality results of similar
concentrations of ethanol and hexane extracts of Jatropha seeds and leaves
revealed that both ethanol and hexane extracts of Jatropha seeds gave higher
mortality percentage than their counterparts of Jatropha leaves extracts. As for
seeds extracts, the concentrations of 0.01, 0.03 and 0.06 gave a percentage
mortality of 26.7, 46.6 and 50 for ethanol extract and 70, 50, 50, for hexane
extract respectively. On the other hand, the same concentrations of Jatropha leaf
extracts of 0.01, 0.03 and 0.06 gave a percentage mortality of 6.7, 0.0 and 13.3
for ethanol extracts and 6.7, 10.0, and 16.7 for hexane extract respectively.
Both, ethanol and hexane extracts of Jatropha seeds gave significantly
higher mortality percentage than the control after 24 hours of exposure. However
only the ethanol extracts of Jatropha seeds gave significantly higher mortality
percentage than the control after 48 hours of exposure. Also both ethanol and
hexane seeds extracts gave significantly higher mortality percentage than the
control after 72 hours of exposure.
All the hexane extracts of the Jatropha leaves gave higher mortality
percentage than the control, but not a significant difference. On the other hand
only the lower and higher concentrations of ethanol extracts of the leaves gave
significantly higher mortality percentage than the control, but not the medium
concentration after 24 hours of exposure. After 48 and 72 hours of exposure only
the higher concentrations of hexane and ethanol of the Jatropha leaves gave
significantly higher mortality percentage than the control.
