Insecticidal and mosquito repellency property of essential oil from hyptis suaveolens leaves

Essential oil was extracted from the leaves of Hyptis suaveolens by hydro-distillation placing 1kg washed fresh in round bottom flasks set up with 1liter distilled water. The Mosquitocidal activity, mosquito larvae (larvicidal) and repellency effect were carried-out using standard modified methods. Percentage yield essential oils gotten as 0.05%. showed very strong larvicidal properties against larvae. There low mortality rate at lower dose, a concentration 6.25ppm 4% over period 6 hours, same 12 24 hours gave 11%. LC50 LC 90 this 25.21 302.67 respectively. At 12.50ppm also recorded 13% recorded, LC90 6.25ppm. 25.00ppm, 20%, for 30% both are 9.575 352.458 no significant differences 50, 100 1000ppm, 100% 6, 0.549 0.853 record death control even after hours. It observed that amount air enters cage affect which mosquitoes repelled. In group kept all sides open (ASO) 65% repelled within 30 minutes while one side (OSO) closed (ASC), 73% 85% time frame. second experiment, surface rats shaven skin where applied. demonstrated dose dependent mosquitocidal activity values 21ppm