author(s)
Kongne Marie Louise, Kouninki Habiba, Fameni Tope Sidonie and Fernand Nestor Tchuenguem Fohouo

abstract
In Maroua, Cameroon, from April to August 2016, the methanol extracts of plants were applied at 0, 100 and 200mL per 50g of cowpea seeds obtained from free pollination (FP), from protected flower from any visit of pollinator (PP) and from a selected resistant variety (B125). The higher rate of mortality was obtained with V. rosea (93.33±5.77) and the lower one was recorded with C. papaya (73.33±5.77) for all the type of cowpea seeds used at 200 mg/mL. The mean larvae were 0±0.0 on FP and B125 with S. longepedunculata and V. rosea respectively. After three months of storage, the higher emergence of cowpea weevil gave a mean value of adult weevil emergence was (5.64±1.19)FP; (9.15±2.97)PP; (7.24±4.28)B125. The weight loss showed 80.0±2% of PP type, 72.66±1.15% of FP type and 69.33±3.05% within the controls. The FP (88.89±19.25%) cowpea seeds preserved germination power more than those of PP and B125 types.