Resistance to alfalfa weevil (AW),Hypera postica(Gyllenhal), detected inMedicago sativaL. has been primarily tolerance to feeding of the larvae. Adult feeding resistance has been found in glandular-haired annualMedicagospecies, but these cannot be hybridized with alfalfa to produce useful cultivars. In this study, two diploid (Medicago glandulosaDavid andMedicago prostrataJacquin) and one tetraploid (Medicago glutinosaMarshall Von Bieberstein) glandular-haired, perennial species were tested for resistance to AW adult feeding. Control plants were perennialM. sativa(susceptible) and annualsMedicago scutellata(L.) Mill andMedicago disciformisDC (resistant). Dry-matter consumption, leaf damage ratings, and numbers of AW on the entries were all lower forM. prostrataandM. glandulosathan for susceptibleM. sativa.M. glutinosadid not seem to be consistently resistant to adult AW feeding.