Pollination Efficiency of Dactylurina Staudingeri (Hymenoptera : Apidae) on Vernonia Amygdalina (Asteraceae) Florets at Dang (Ngaoundere, Cameroon)

Abstract

Cameroon with exposed nests who are often fixed on tree branches at a height above 4 m [12]. This social bee produces honey with a quality different to that of honeybee [10, 11]. It is known to visit some plant species such as Zea mays at Yaoundé [13], Endosiphon prumiloides at Campo [14], Jatropha sp. at Kinshasa [11], Cucumeropsis manii at Yaoundé [15] and Vigna unguiculata in Ghana

Pollination efficiency of Apis mellifera (Hymenoptera: Apidae) on Solanum nigrum (Solanaceae) at Meskine (Maroua, Cameroon)

“…-Treatment 3 in 2019 or 7 in 2020: 200 flowers protected using gauze bag nets to prevent insect or any other organism visits and destined to be visited exclusively by A. mellifera; as soon as each flower of these treatments was opened, the gauze bag was delicately removed and this flower was observed for up to 10 minutes; the flower visited once by A. mellifera was then reprotected (Tchuenguem and Népide, 2018); -Treatment 4 in 2019 or 8 in 2020: 100 flowers protected using gauze bag nets and destined to be uncovered then rebagged without the visit of insects or any other organism (Diguir et al, 2020); as soon as each flower of these treatments was opened, the gauze bag was removed and this flower was observed for up to 10 minutes, while avoid insect or any other organism visits (Diguir et al, 2020).…”

“…The evaluation of the effect of insects including A. mellifera on S. nigrum production was based on the impact of flowering insects on pollination, the impact of pollination on S. nigrum fruiting, and the comparaison of the fruiting rate, the number of seeds per fruit and the percentage of normal seeds of treatments 1, 2, 4, 5, 6 and 8. For each year, the fruiting rate due to the foraging insects including A. mellifera (Fri) was calculated using the following formula (Diguir et al, 2020): Fri = {[(FX -FZ) / (FX + FY -FZ)] × 100}, where FX, FY and FZ are the fruiting rates in treatment X (flowers left in free pollination), treatment Y (flowers protected from all insect visits) and treatment Z (flowers bagged then uncovered and rebagged without insect or any other organism visit). The fruiting rate of a treatment (Fr) is Fr = [(b / a) × 100], where b is the number of fruits formed and a the number of viable flowers initially set (Tchuenguem et al, 2001).…”