Preliminary study of the parasitic complex associated with Dittrichia viscosa in Andalusia

5 páginas, 2 figuras, 1 tabla.-- Comunicación presentada al 3rd European Meeting of the OILB/Wprs Working Group "Integrated Protection in Olive Crops" celebrado en (Bragança) Portugal del 10 al 12 de octubre de 2010.The interaction of organisms in the organic management cultivation of olive trees is caused by the diversity of plant species growing nearby, which directly influences beneficial insects. The systematic and widespread elimination of these plant species increases populations of insects harmful to olive trees. Among the plant species historically associated with olive groves is the Dittrichia viscose L. Aiton, a perennial plant that blossoms between September and October. Its flowers are infested with Myopites stylata Fabricius, dipteran that causes gall formation where the larvae are parasited by Eupelmus urozonus, one of the main parasitoids associated with the olive fruit-fly (Bactrocera oleae). The aim of this study is to analyse the parasitic complex of Myopites stylata associated with Dittrichia viscosa in three olive zones in Andalusia (southern Spain). Galls were collected and kept separately in glass vials under incubator room conditions until adults emerged (photoperiod of 14:10h (L:D) at a temperature of 25ºC ± 3ºC. We observed the presence of Hymenoptera from the Chalcidoidea superfamily belonging to the Eurytomidae, Eupelmidae, Pteromalidae and Torymidae families in a decreasing order of quantity. The number of families, as well as the number of adults present in galls, changed according to the geographical location of the galls.Peer reviewe