Comparative susceptibility of two Japanese encephalitis vectors from Mysore to six insecticides
Vijayan, V.A.; Revanna, M.A.; Vasudeva, K.S.; Pushpalatha, N.; Poornima
Indian Journal of Medical Research 97: 215-217
1993
ISSN/ISBN: 0019-5340 PMID: 8262575 Document Number: 409369
Larval populations of Culex tritaeniorhynchus and C. fuscocephala from Mysore city were tested for their susceptibility against two pyrethroids viz., cypermethrin and deltamethrin and four organophosphorus (OP) compounds viz., fenthion, fenitrothion, temephos and malathion. The investigations revealed that, among the pesticides tested, efficacy of pyrethroids was very high as compared to OP compounds. C. tritaeniorhynchus was found to be highly tolerant to all the insecticides used. It registered 4.0, 6.5, 17.0, 6.5, 14.0 and 1.5 times more tolerance than C. fuscocephala to cypermethrin, deltamethrin, fenthion, fenitrothion, temephos and malathion respectively in terms of the LC-50 value. Further studies are needed to determine the development of resistance if any, by C. tritaeniorhynchus, an important JE vector in Karnataka.