Larvicidal Activity of Extracts on Larvae

The aim of this study was to evaluate the chemical composition and the larvicidal activity of leaf and flower extracts against larvae. Twenty-four compounds were found in the leaf extract, and the major compounds were phytol (23.1%), 9,12,15-octadecatrienoic acid, ethyl ester (21.3%), and hexadecanoic acid, ethyl ester (12.8%). In the flower extract, twenty-four compounds were also identified and the major compounds were -amyrin (35.7%), -amyrin (16.4%), and ()-geranyl linalool (9.6%) by gas chromatography coupled to mass spectrometry. The larvicidal activity was evaluated by larval immersion test. The lethal concentrations (LC) obtained from leaf extract were LC = 4.89 and LC = 11.14 mg/mL and from flower extract were LC = 3.82 and LC = 11.03 mg/mL, and the positive control presented LC = 0.40 and LC = 1.14 mg/mL. Thus, extracts are promising alternatives to control larvae.