Relative efficacy of five synthetic pyrethroids against four vector mosquitoes, Anopheles culicifacies, Anopheles stephensi, Culex quinquefasciatus and Aedes aegypti
Mittal, P.K.; Adak, T.; Subbarao, S.K.
Indian Journal of Malariology 39(1-2): 34-38
2002
ISSN/ISBN: 0367-8326 PMID: 14686108 Document Number: 551099
The relative efficacies (LT50, lethal time for 50% mortality) of deltamethrin, lambda-cyhalothrin, cyfluthrin, permethrin and bifenthrin against laboratory reared pyrethroid susceptible strains of Anopheles culicifacies, A. stephensi, Culex quinquefasciatus and Aedes aegypti were examined. Blood-fed mosquitoes were exposed to insecticide-treated papers in batches of 15 mosquitoes/tube in 3 replicates for each of at least 5 different exposure times (0.5-60 min). After exposure, the mosquitoes were transferred to the holding tube for recovery, mortality was recorded after 24 h and LT50 values were determined. The respective LT50 values of deltamethrin, lambda-cyhalothrin, permethrin, cyfluthrin and bifenthrin against the 4 vectors were: <0.5, <0.5, 0.74, <0.5 and 1.78 min for Anopheles culicifacies; 2.4, 7.89, 2.59, 2.95 and 36.25 min for A. stephensi; 5.17, 12.77, 11.92, 6.41 and 29.32 min for C. quinquefasciatus; and 2.36, 17.23, 2.86, 2.70 and 27.82 min for Aedes aegypti. Anopheles culicifacies was the most susceptible to all the synthetic pyrethroids. Cyfluthrin was the most effective against A. culicifacies, whereas deltamethrin was the most effective against the 3 other mosquitoes. Permethrin was least effective against A. culicifacies and C. quinquefasciatus, whereas bifenthrin was least effective against A. stephensi and Aedes aegypti.