Seasonal Abundance of Primary Parasitoids and Hyperparasitoids Associated with Acyrthosiphon pisum (Harris) and Acyrthosiphon kondoi Shinji (Homoptera

Seasonal abundance of primary parasitoids and hyperparasitoids associated with Acyrthosiphon spp. was studied in an alfalfa field in 2000. Two species of primary parasitoids were recorded: Aphidius ervi and Praon barbatum. Mean parasitism by A. ervi and P. barbatum peaked at 3.5% on 10 July and 13.0% on 29 June. Six species of hyperparasitoids were also collected. Rates of parasitism of A. ervi and P. barbatum reached over 90% and 80%, respectively. Dendrocerus carpenteri and Asaphes suspensus were the dominant species among hyperparasitoids.