| Popis: |
The groundnut weevil, Caryedon serratus, causes significant losses of groundnut stocks in Senegal by developing larvae in the seeds. Essential oils extracted from leaves of two plants that grow naturally in Senegal, i.e. the sugar apple (Annona senegalensis Pers.) and lantana (Lantana camara), were tested on adults of Caryedon serratus. Purified and pulverized kaolin was flavoured with essential oils of A. Senegalensis Pers. and L. camara (Lam) obtained through vapour distillation. Adults C. serratus aged 24 hrs at most were treated with 0.1 g of powder flavoured with increasing doses (12.5 to 50 il/g. of powder) of essential oil. With increasing doses (12.5 to 50 il/g of powder) of essential oil. The powder Aromatized with essential oil of A. senegalensis at concentration 25 il/g. induced 50% mortality after 36 hrs of contact at concentration 25 il/g and 100% after 48 hrs at 50 il/g. The powder mixed with the essential oil of L. camara induced after 12 hours of contact 22% mortality at the dose of 12.5 il/g, the mortality increased with dose duration of exposure and reached 97.22% after 36 hrs with 50il/g. |
