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During the blooming period of different strawberry cultivars we captured flower visitors by walking between beds’ rows to verify bee diversity and bee abundance in two commercial fields in São Paulo State (Brazil). In order to know the influence of biotic and abiotic factors on bee presence and bee activity at flowers we registered data about the weather conditions, flower availability, pesticides application, surrounding vegetation and wild bee nests and bee hives close to the cultivated areas. In two fields the bees were the most abundant visitors of strawberry flowers, being most individuals from Apini and Meliponini tribes. The difference found in bee abundance and diversity between these two areas suggested that although the use of pesticides has been less intense in one them, the narrow surrounding patch of secondary forest preserved around the other must have be favoured the existence and maintenance of wild nests of diverse bee species, particularly the stingless bees. The presence of large number of pollen grains carried by bees from Geotrigona subterranea, Schwarziana quadripunctata and Trigona spinipes, the behaviour of these bees on strawberry flowers similar to that of Apis mellifera and their constant foraging activity during the blooming period suggests that these species can be very important to strawberry crop pollination where they are abundant.

Estudo de agentes polinizadores em cultura de morango (Fragaria x ananassa Duchesne - Rosaceae)