Impact of single visit of Lipotriches collaris Vachal 1903 (Hymenoptera: Halictidae) on Phaseolus vulgaris (Fabaceae) flowers at Maroua (Cameroon)Chantal Douka, Joseph Lebel Tamesse, Fernand-Nestor Fohouo tchuenguem196_pdf.pdf072-076Lipotriches collaris, Phaseolus vulgaris,pollen, nectar, pollination.8194To evaluate the impact of single visit of Lipotriches collaris on pod and seed yields of Phaseolus vulgaris (Red and Small Seeds), its foraging and pollinating activities were studied in Maroua, during 2010, 2011 and 2013 cropping seasons. Treatments included bagged flowers to avoid all visits and bagged flowers limited on a single visit of L. collaris. Observations were made on 147, 139 and 138 flowers in 2010, 2011 and 2013 respectively. The foraging behavior on flowers and its pollination efficiency (fruiting rate, number of seeds/pod and percentage of normal seeds) were recorded. Lipotriches collaris foraged pollen and nectar. 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