Impact of aqueous extracts of on the entomofauna and the seed yield of at Boklé (Garoua, Cameroon).

There is a frightening decline in the population pollinators around the world due to the over usage of synthetic pesticides, leading to the directly reduce of plant production. Plant extracts with insecticidal properties could be eco-friendly alternatives to synthetic pesticides in maintaining the pollinator population and the diversity of the ecosystem. The impact of aqueous extracts of L., Dehnh. and L. was investigated on the entomofauna and the seed yield of L. cotton. The study was carried out in RCBD, four times replicated: 3 extracts x 1 standard synthetic insecticide (TEMA) x 1 control x 4 groups of flowers (group 1: flowers free to insect visits, group 2: flowers protected from insects using gauze bags, group 3: protected flowers and opened exclusively to sp. and group 4: protected flowers opened from time to time without any visit of insect). was found to be visited by the insects belonging to five orders, 10 families and 18 species. sp.1 and were the major pollinators during the rainy and dry seasons, respectively. The number and quality of seeds visited exclusively by sp.1 were significantly improved by extract. During the dry season, and extracts as well as the standard insecticide improved the number of seeds and the percentage of normal seeds harvested from the flowers allowed to be visited by insects; that was probably due to their insecticidal effects which protected plants from pest damage. Therefore, aqueous extracts of are good candidates for incorporation in integrated pest management programs to minimize the risk of synthetic pesticides to pollinators, hence to increase the yield and the quality of seeds.