Pollination activity of honey-bee (Apis mellifera) on onion (Allium cepa), 1 : Honey-bee visitation and its influence on seed yield

abeille abejas alliaceae allium allium cepa animal animales animals apis apis mellifera arthropode arthropods bees bulbous vegetables crops cultivos economic plants economic sectors fisiologia fonction physiologique hortalizas (plantas) hortalizas de bulbo hymenoptera industria industria de semillas industrie industrie des semences industry insecte insectos insects invertebrados invertebrates liliiflorae monocotyledons physiological functions physiologie physiology plantas plante plante de culture plants polinizadores pollination pollinators pollinisateur pollinisation production de semences reproduction secondary sector secteur secondaire sector secundario seed industry seed production vegetable crops