Phytophagous insects representing 106 species, 36 families and seven orders, and one eriophyid mite, fed on seepwillow,Baccharis salicifolia(Ruiz Lopez and Pavon) Persoon (=glutinosaPersoon) (Asteraceae: Astereae) in the study area. Sixteen (18%) of these were economically important. About 50% of the species were polyphagous, 10% apparently feed only on plants in Asteraceae, and 6% were apparently restricted to feeding in the genusBaccharis. Seepwillow was a host for about 82 species of foliage- and sap-feeding insects. Flower-visiting insects, representing 37 species, 15 families and three orders, were collected from flowers of seepwillow between July and December.