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Turkish Alfalfa Cultivars Screened for Alfalfa Weevil Resistance

USDA-ARS, Germplasm Quality and Enhancement Lab., Bldg. 467, BARC-East, Beltsville, MD 20705
USDA-ARS, Plant Sciences Inst., Bldg. 005, BARC-West, Beltsville, MD 20705

^* Corresponding author.

Alfalfa (Medicago sativa L.) cultivars have been developed with tolerance to the alfalfa weevil [Hypera postica( Gyllenhal)], but not antibiosis or nonpreference. This study evaluated 28 Turkish alfalfa cultivars as sources of resistance expressed as antibiosis or feeding nonpreference. One hundred plants of each cultivar were tested in the laboratory to characterize resistance. Resistance was evaluated by caging 10 neonate alfalfa weevil larvae on plants for 8 d. Mean larval survival and weight after 8 d feeding was compared with that on the susceptible cultivar Ranger. Plants selected for resistance were vegetatively propagated and re-evaluated in replicated tests. Larval survival and development on Turkish cultivars did no differ from that on Ranger although larval survival was lower on three selected clones in one experiment. These clones did not demonstrate resistance when retested approximately 2 mo later. None of the Turkish cultivars appeared to be promising sources of antibiosis or nonpreference.

Received for publication August 2, 1989.