Zone de Texte: Apis mellifera was the most frequent visitor (62%), followed by Musca domestica. Honeybee visited 94,12% of the flowers and its foraging activity was observed and quantified at different solar times. Zone de Texte: POLLINATION The failure of pollination due to the absence of pollinating agents is one of the major factors for low seed set. During September 2005, in the high flowering season, 3 day census of visitor insects were carried out, monitoring 287 inflorescences in 16 locations. Zone de Texte: Biology and reproduction of the water hyacinth in the Guadiana River (Badajoz) Trinidad Ruiz Téllez, Elsa Martín de Rodrigo López, Gloria Lorenzo Granado, Eva Albano Pérez, Adolfo Muñoz Rodríguez, Juan Manuel Sánchez Guzmán. Zone de Texte: Apis mellifera was the most frequent visitor (62%), followed by Musca domestica. Honeybee visited 94,12% of the flowers and its foraging activity was observed and quantified at different solar times. Zone de Texte: POLLINATION The failure of pollination due to the absence of pollinating agents is one of the major factors for low seed set. During September 2005, in the high flowering season, 3 day census of visitor insects were carried out, monitoring 287 inflorescences in 16 locations. Zone de Texte: Biology and reproduction of the water hyacinth in the Guadiana River (Badajoz) Trinidad Ruiz Téllez, Elsa Martín de Rodrigo López, Gloria Lorenzo Granado, Eva Albano Pérez, Adolfo Muñoz Rodríguez, Juan Manuel Sánchez Guzmán.

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