Baccharis sarothroides Gray was studied near Portal, Cochise Co., Arizona (USA) during May and June 1981. Plants bore wounds that were probably produced by insects and were heavily visited by a variety of other insects, predominantly parasitic wasps of the families Braconidae and Chalcididae whose hosts are wood-boring beetles. Visitation patterns were similar from plant to plant and day to day. Visitors competed for feeding sites with a variety of behaviors and in a complicated pattern of dominance. Although the plant loses moisture and nutrients, it is possible that the relationship with visitors is mutualistic if vistor activity intimidates herbivores or parasitoids oviposit on Baccharis herbivores. The wounds would thus function in a manner analogous to extrafloral nectaries. Similar patterns of feeding were seen on Baccharis glutinosa Pers., and faunas of visitors were comparable between both Baccharis species and that of Koeberlinia spinosa Zucc.