RESUMEN
The handling of the vegetation cover is known as one of the major cultural strategies in pest control. This study shows the interactions between Liriomyza and their hosts-plants found in three natural parks from the Community of Valencia for 6 of the 13 Liriomyza species (Diptera: Agromyzidae) cited from Spain as potential pests for agriculture: L. bryoniae (Kaltenbach, 1858), L. cicerina (Rondani, 1875), L. congesta (Becker, 1903), L. strigato (Meigen, 1830), L. brassicae (Riley, 1884), and L. trifolii (Burgess in Comstock, 1880). Three new interactions for science to L. brassicae and L. trifolii are recorded. The importance of these interactions lies in the potential of being able to act as plant reservoirs for development of pest species alternative to crops. Distribution of Lirfomyza species by botanical families and species, including the study of beta diversity for the studied biotopes, are showed.