Journal Of Tropical Biosciences
Volume No: 11|
Page No: 68
| FullText PDF
Title: TOXICOLOGICAL EFFECTS OF THE EXTRACTS OF THE PLANT, ALOTROPIS PROCERA (ASCLEPIADACEAE) ON THE LARVAE OF THE MOSQUITO, AEDES (STEGOMYIA) VITTATUS (BIGOT)
MUSA, A.O., *SOW, G.J., YISA, A.G.
DEPARTMENT OF BIOLOGICAL SCIENCES, AHMADU BELLO UNIVERSITY, ZARIA
The methanolic and petroleum ether extracts of the leave and bark of Calotropis procera were tested for larvicidal activity against Aedes vittatus third instar larvae. Both extracts showed larvicidal effects. At the highest concentration (1000 mg/L) of methanolic leaf and bark extract, a mean percentage mortalities of 62 and 20 respectively were obtained after 24 hours exposure while 83 and 36 were obtained after exposure for 48 hours. Petroleum ether extract of the leaves (10 mg/L) on the other hand yielded a mean percentage mortality of 61 and 87 respectively after 24 and 48 hours exposure. The median lethal concentrations (LC50) obtained from ethanolic leaf and bark extracts after 24 hours exposure was 2768.22 and 10459.24 ppm, respectively; and after 48 hours exposure was 559.11 and 5662.39, respectively. The LC50 values obtained after 24 and 48 hour exposure of larvae petroleum ether leaf extract were respectively 12.99 and 1.66. The implications of the findings in this work are discussed.
In conclusion, the methanolic leaf and bark extracts of Calotropi sprocera though caused mortality, they were not very effective against the larvae of Aedes vittatus. On the other hand, petroleum ether provides a solvent of choice for use against the larvae of Aedes vittatus. The use of this extract will give safer and cheaper approach in the control of this species of mosquito.