Abstract
Diapause in the alfalfa seed chalcid, Bruchophagus roddi (Gussakovsky), is 1 of the principal mechanisms for survival and perpetuation of this multivoltine species in seed alfalfa. The chalcid actively developed through 2 generations, which lasted about 2½ mo from about June 15 to Sept. 1. The chalcid diapaused in the prepupal stage. Diapause began about Sept. 1 and was completed about Dec. 1, 3 mo later, when 100% of the population was in diapause. The daylength for induction ranged from 10½–13 h; only about 40% of the population diapaused between 10¼ and 11 hours. Diapause lasted about 5½ mo, from Dec. 1 to April 15. Termination of diapause and emergence of the population occurred over a period of about 2 mo, from April 15 to June 15. Daylength of 13–14½ h terminated diapause.
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