Larvicidal Susceptibility Studies of a few Strains of Aedes Vectors of Bengaluru, Karnataka, India
Abstract
Objective: To determine the larvicidal activity of four insecticides against different strains of two dengue vectors-Aedes aegypti and Aedes albopictus of Bengaluru. The study thus aims to determine the variation of resistance/ susceptibility levels in Aedes mosquitoes collected from different localities of Bengaluru against four insecticides viz. chlorpyrifos, temephos, cypermethrin and lambda-cyhalothrin.
Methods: Eighteen strains of Ae. aegypti and three strains of Ae. albopictus were collected from different parts of Bengaluru. They were maintained and reared in the laboratory for a few generations. Susceptibility studies were carried out on freshly collected third instar larvae according to the standard procedure of World Health Organisation.
Results: Ae. aegypti is tolerant to WHO recommended diagnostic dose of temephos. A moderate level of tolerance was found in HSR strain of Ae. aegypti to lambda-cyhalothrin (RR90=38.8). Ae. aegypti proves to be more tolerant than Ae. albopictus , to all the larvicides tested. The synthetic pyrethroids used-cypermethrin and lambda-cyhalothrin were more effective in their larvicidal activity than the organophosphates studied-chlorpyrifos and temephos.
Conclusion: The present findings form baseline data on the susceptibility status of two arboviral vectors to different larvicides. This study would help in better vector control measures and effective source management in Bengaluru.
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