Bio-efficacy of Ocimum gratissimum, Hyptis suaveolens and Bti on the eggs and pupae of Aedes aegypti
KM Remia, S Logaswamy, R Shanmugapriyan
A laboratory study was conducted to evaluate the bio-efficacy of Ocimum gratissimum, Hyptis suaveolens and Bti on the eggs and pupae of Aedes aegypti. The LC50 value of methanolic extract of O.gratissimum was 64.15 ppm and 74.49 ppm against the eggs and pupae. H. suaveolens caused LC50 for ovicidal and pupicidal effect at 72.13 and 99.87 ppm. Bacillusthuringiensis israliensis required 12.57ppm registered as LC50 value against the eggs. The synthetic insecticide chlorpyrifos at 11.68 and 48.16 ppm produced 50% mortality of eggs and pupae. Among the treatments Bti was efficient and ecofriendly ovicidal and pupicidal for Aedes aegypti.