Susceptibility of Aedes Aegypti Against Various Insecticides in Lahore, Pakistan

Susceptibility of Aedes Aegypti Against Various Insecticides

Abstract

Dengue fever is an arbo-viral infection, widespread all over the world. In 21th Century, there is no safe affordable and effective vaccine accessible yet; vector control is that most effective method for the control of the disease

Objective: To determine the susceptibility status of wild and laboratory strains larvae and adults of Aedes aegypti against different group of insecticides in Lahore city.

Method: From Lahore sites, larvae were collected where insecticides used for wild strain at high frequency and quantity. The Insectary of National Institute of Malaria Research and Training (NIMRT), Lahore, Pakistan, adults and larvae were collected for laboratory strain.The laboratory strains for larvae bioassays were used. The mosquitoes populations indoor and outdoor collected in 2009, hatched from larvae into adults insectary in Lahore, Pakistan. During this study, four major insecticides groups are used which include Pyrethroids (Deltamethrine 2.5% SC), Neonicotenoids (Imidacloprid 5% SC), Phenyl-pyrazoles (Fipronil 2.5% EC) and Organophosphates dichlorvos (DDVP 50% EC). For data analysis, Minitab statistical software (Version 13.20) used for data expressed as mean ± S.E.M from bioassays. By using EPA Probit, LC was estimated with 95% confidence. The 50 statistically significant p value was <= 0.05. For comparing the concentrations of insecticides, Duncan's multiple range tests was used with significant difference (5% level) using at New Costat.

Results: Different location of Lahore samples, Imidacloprid the most toxic to Aedes aegypti's wild strains on the other hand while Fipronil was also active for wild larval samples. Deltamethrine showed least activity against both adults and larval strains. The susceptibility of the eld strains was lower than laboratory strains; resistant ratio varies from insecticide to insecticide. In reporting results, mosquitos' population was resistance because of infrequent and incomplete coverage.

Conclusions: This study concluded that Pyrethroids and agriculture pest control play role in indirect growth of insecticides' classes. Based on this study it is suggested that by using new strategies to prevent and delay in growth of insecticides will helpful in Lahore, city, Pakistan.