As in the case of weeds, species composition was quite different among sole crops and intercrops. Main differences among assemblages were related to frequency or occurrence of species conforming faunistic groups and they could be explained by differences in weed communities [16], canopy structure and pest management among crops [38]. Differences in richness could be explained by variations in weed community structure, canopy structure and pest control practices among crops. A group of species were common to all treatments, whereas some group species were more frequent or occurred only in a particular cropping treatment (i.e. for intercrops Lonchopteridae, Pentatomidae in Exp 1, and Chalcididae, Chrysopidae, Empididae in Exp 2). The same response was observed in previous investigations in sole crops of the Pampas