Abstract
Resistance to alfalfa weevil (AW), Hypera postica (Gyllenhal), detected in Medicago sativa L. has been primarily tolerance to feeding of the larvae. Adult feeding resistance has been found in glandular-haired annual Medicago species, but these cannot be hybridized with alfalfa to produce useful cultivars. In this study, two diploid ( Medicago glandulosa David and Medicago prostrata Jacquin) and one tetraploid ( Medicago glutinosa Marshall Von Bieberstein) glandular-haired, perennial species were tested for resistance to AW adult feeding. Control plants were perennial M. sativa (susceptible) and annuals Medicago scutellata (L.) Mill and Medicago disciformis DC (resistant). Dry-matter consumption, leaf damage ratings, and numbers of AW on the entries were all lower for M. prostrata and M. glandulosa than for susceptible M. sativa. M. glutinosa did not seem to be consistently resistant to adult AW feeding.
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