Insecticidal activity of Annona senegalensis leaves essences against Caryedon serratus Ol. (Coleoptera, bruchidae) pest of groundnut stocks
Kouniassey Jimmy Charles Gbaya, Mamecor Faye, Toffène Diome, Mbacké Sembène
Biological activity of essences from Annona senegalensis leaves was evaluated in laboratory, on various stages of development of Caryedon serratus, a pest of groundnut stocks. The tested essences are obtained by steeping the powder with three solvents (methanol, hexane and ethyl acetate). The acetate fraction kills 100% of the eggs with 0.1g/ml whereas the methanol fraction kills 33% with 0.01g/ml. The crude extract and the hexane fraction have been shown to be ineffective but lead to a reduction of larval lifetime. Chrysalis lifetime and fecundity of the survivors are not modified by the various extracts; however, an increase in longevity is noted with all extracts. On adults, the effect depends on the extract and the dose used. After 72 h at high concentration, the crude extract and the methanol fraction eliminate 75% and 94% of insects, respectively; with a concentration of 0.01g/ml, the crude extract and the hexane fraction kill 75.86% and 47.22% of the insects, respectively, and at low concentration (0.001 g/ml) the acetate fraction acts and eliminates 94 %. Methanol and acetate fractions could be used in stocks protection, by applying them at the early infestation and at the period of emergence of the surviving adults.
Kouniassey Jimmy Charles Gbaya, Mamecor Faye, Toffène Diome, Mbacké Sembène. Insecticidal activity of Annona senegalensis leaves essences against Caryedon serratus Ol. (Coleoptera, bruchidae) pest of groundnut stocks. International Journal of Zoology Studies, Volume 6, Issue 3, 2021, Pages 19-25