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

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

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

Results: The results of the study revealed that the 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 study area of Dehradun while 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.