Susceptibility of temephos against Aedes aegypti and Anopheles stephensi larvae in Dehradun, Uttarakhand, India.

Abstract

Background objectives: Temephos is being used regularly to control immature vectors of vector-borne diseases in various states in India.

Methods: We used World Health Organization method to evaluate larval susceptibility status of Aedes aegypti and Anopheles stephensi against temephos in Dehradun, Uttarakhand in India.

Results: The results of the study revealed that larval mortality in different localities ranged from 67.11% to 98.22%, the lowest mortality was recorded from Kedarpuram (67.11%) and highest larval was recorded from Vikash Nagar (98.88%). The study revealed that most of larval populations of Ae. aegypti were resistant or under verification required category against temephos at diagnostic concentrations collected from six different localities of the study area of Dehradun. Only one larval population of Ae. aegypti was found susceptible. However, Anopheles stephensi larvae collected from all sites were susceptible at diagnostic concentration of temephos.

Interpretation conclusion: The study highlights the potential development of resistance to temephos in Ae. aegypti across most of the study areas in Dehradun.