mosquitocidal activity of hyptis suaveolens (l.) poit (lamiaceae) extracts against aedes aegypti, anopheles stephensi and culex quinquefasciatus (diptera: culicidae)

Hyptis suaveolens extracts were evaluated for larvicidal, adult emergence inhibition and ovicidal activity against vector mosquitoes viz., Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus. Among the vector mosquito species, Culex quinquefasciatus was found to be the most susceptible with a LC50 value of 203.37 ppm in hexane extract. Significant adult emergence inhibition was noted when larval and pupal development was arrested resulting in decreased pupal transformation. Larval and pupal periods were prolonged with appearance of larval–pupal and pupal–adult intermediates, with an overall increase in the developmental period and ovicidal activity was more pronounced in the egg rafts of Culex quinquefasciatus.