Phytophagous insects representing 37 families and 88 species fed on tarbush,Flourensiacernua DC. Thirty-nine of these species were polyphagous, 11 were oligophagous, and 2,Goniatron planum BrunerandBuccalatrix flourensiaeBraun, were specific or apparently restricted to tarbush. The feeding specificity of 36 species was not determined. None of the phytophages substantially damaged tarbush. The psyllidKuwayana medicagnisCrawford was one of the most common insects on the plant. It caused moderate leaf curling in ≍7% of the foliage in early spring. Relative frequency, associated plant parts, geographic distribution, and phenology of insects on tarbush are also reported.