Toxicity of Hexanolic Extract of Dennettia

The hexanolic extract of Dennellia tripetala was tested for acute toxicity on 3 Instar larvae of Aedes aegypti reared in the Laboratory at the Department of Zoology, University of Ibadan,. Six sets of graded concentrations 30pprn, 50ppm 60pprn 70pprn, 80ppm and 90ppm were tested for acute toxicity on the 3 instar larvae of Aedes agypti and total percentage mortalities recorded at intervals of 12, 24, 48, 72 and 96 hours in each test. Effects of sunlight and ultraviolet radiation were tested on the potency of the extract, at 2, 4 and 8 hours respectively. The mean lethal concentration LC5O was 44.7 ± 0.82ppm. The toxicity of the extract does not persist for a longtime; the potency of the extract was slightly affected by sunlight while the potency was activated by ultraviolet radiation.