Pyrethroid resistance in adult mosquitoes, Aedes aegypti from Jaipur city, Rajasthan
In the present study, resistance status was evaluated in adult mosquitoes of Aedes aegypti against two synthetic pyrethroids from urban area of Jaipur, Rajasthan during July, 2015 to January, 2017. Mortality percentage for field and susceptible mosquitoes stain was determined against cypermethrin and permethrin by regression analysis using log probit method by using CDC bottle bioassay. Susceptibility of A. aegypti was assessed more to cypermethrin (LC50= 0.0003 and LC90=0.0002) as compared to permethrin (LC50=0.02 and LC90=0.01) on the basis of insecticidal efficacy. Some extent of resistance have been occurred in dengue vectors against pyrethroids due to regular use. Resistance status was expressed as resistance ratio (RR), against permethrin it was observed to be RRLC50= 2 and RRLC90=2.5 in field collected population, whereas, regarding cypermethrin resistance level was observed at RRLC50= 1.5 and RRLC90= 3.16 as compared to laboratory susceptible population.