Annamalai University

About: Annamalai University is a education organization based out in Chidambaram, Tamil Nadu, India. It is known for research contribution in the topics: Lipid peroxidation & Antioxidant. The organization has 8098 authors who have published 10758 publications receiving 203872 citations.

Differential larvicidal efficacy of four species of Vitex against Culex quinquefasciatus larvae.

Abstract: The early fourth instar larvae of Culex quinquefasciatus, reared in the laboratory were used for larvicidal assay with leaf extracts of Vitex negundo, Vitex trifolia, Vitex peduncularis and Vitex altissima. The methanol extracts of the four species possessed varying levels of larvicidal nature. The highest larvicidal activity was found with the extract of V. trifolia (LC50 = 41.41 ppm) followed by V. peduncularis (LC50 = 76.28 ppm), V. altissima (LC50 = 128.04 ppm) and V. negundo (LC50 = 212.57 ppm).

Bioefficacy of Cassia fistula Linn. (Leguminosae) leaf extract against chikungunya vector, Aedes aegypti (Diptera: Culicidae).

Abstract: The leaf extract of Cassia fistula with different solvens viz, methanol, benzene and acetone were studied for the larvicidal, ovicidal and repellent activity against Aedes aegypti. The extract exhibited dose dependent activity and produced significant mortality. The 24 h LC50 concentration of the extract against Aedes aegypti were observed at 10.69, 18.27 and 23.95 mg/l respectively. Mean percent hatchability of the ovicidal activity was ob- served 120.00 h after treatment. The percent hatchability was inversely proportional to the concentration of extract and directly propor- tional to the eggs. The crude extract of Cassia fistula shows significant repellency against Aedes aegypti. These results clearly reveal that the crude extract of Cassia fistula served as a potential larvicidal, ovicidal and repellent agent against chikungunya vector mosquito, Aedes aegypti.