Abstract
Female Bruchaphagus roddi (Gussakovsky)exposed to crude extracts of seed pods of both red clover and alfalfa responded positively by orienting to extracts of alfalfa pods but not red clover pods. B. gibbus (Gussakovsky) responded to extracts of red clover pods but not alfalfa pods. Both species responded to extracts of both red clover and alfalfa flowers. When individual chemicals from red clover were bioassayed with B. gibbus, 19 of 31 evoked a positive behavioral response. Several compounds present only in alfalfa evoked a positive response from B. gibbus and B. roddi. Several compounds present only in red clover evoked a positive response from B. gibbus but not B. roddi. Those chemicals that evoked positive responses are believed to regulate different modes of behavior during host selection.
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