Abubakar AA; Kolawole, DO; Babatunde, SK; Sunday, O; Ameen, N. (2014). Investigation of mosquitocidal Activity of a Combined Extract of Bryophyllum and Aloe barbadensis Leaves. Agriculture and Biology Journal of North America 5(3): 118-122.
ABSTRACT
This study was focused on investigating the combinatorial effect of Aloe barbadensis and Bryophyllum pinnatum on mosquito population with the aim of producing an effective anti-mosquito agent. Extracts from both plants were combined and prepared in varying concentrations of 100mg/ml, 50mg/ml and 25mg/ml and were applied against laboratory-bred mosquito of known population densities. Mortality of the mosquito after application of each concentration of the extract was assessed at 15 minutes interval for 1 hour by dividing the number of death mosquito by the total number originally bred in the box and the product multiplied by 100. The investigation revealed 6.6% mortality rate when 25mg/ml of the combined extract was applied while 68.9% was recorded for 50mg/ml over the one-hour period of investigation. Maximum toxicity of 100% was recorded within 15 minutes when 100mg/ml of the extract was applied to the mosquito density indicating that as the concentration of the extract increases, its toxicity on the insect also increase. In conclusion, the combinatorial effect of both extracts showed a promising mosquitocidal activity especially at a concentration of 100mg/ml of combined extract
Key words: Mosquitocidal, Combinatorial effect, Aloe barbadensis Bryophyllum pinnatum