Larvicidal Effect of Ipomoea stolonifera on Laboratory-Reared and Field-Collected Aedes aegypti Mosquitoes in Enugu, Nigeria
Larvicidal Effect of Ipomoea stolonifera on Laboratory-Reared and Field-Collected Aedes aegypti Mosquitoes in Enugu, Nigeria
Godwin Ikechukwu Ngwu1*, Maria Ifeyinwa Ngwu2, Fabian Chukwuemenam Okafor1, Aruh Ottah Anaga3 and Christopher Didigwu Nwani1
ABSTRACT
Comparative study of the effects of methanolic crude extracts of Ipomoea stolonifera on 4th instars larvae of both laboratory-reared and field-collected Aedes aegypti were carried out. The 4th instars larvae of laboratory-reared and the field-collected A. aegypti mosquitoes were exposed to 5000mg/L, 2000 mg/L, 1000 mg/L, 500 mg/L, 100 mg/L, 50 mg/L of the extract. The solvent for the extract, dimethyl sulphoxide (DMSO) was used as control. The results indicate concentration dependent mortalities and significant differences (P<0.05) in the mean percentage mortality between the laboratory-reared and field-collected Aedes mosquitoes. The mortality rate due to the extract was found to be less in the field collected A. aegypti (LC50 = 2.81 ± 0.14; LCI = 2.55; UCI = 3.11) than the laboratory-reared ones (LC50=1.24±0.09; LCI = 1.07; UCI = 1.43) after 24 h exposure. The median larvicidal concentration LC50 values of the extract were 1.24 ± 0.09g/L and 2.81 ± 0.14g/L for 4th instars larvae of both laboratory-reared and field-collected mosquito larvae respectively. Further research is recommended on the isolation of the active ingredients of I. stolonifera for use in effective control of mosquito.
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August 2020
Vol. 52, Iss. 4, Pages 1225-1630
