Abstract
Fourteen parasitoid species were recovered from strawberry leafroIler, Ancylis comptana (Froelich), larvae and pupae collected in central Iowa strawberry fields in 1987 and 1989. Parasitism by the two most abundant parasitoid species, Itoplectis conquisitor (Say) (Hymenoptera: Ichneumonidae) and Pediobius facialis (Giraud) (Hymenoptera: Eulophidae), was synchronous with high A. comptana pupal densities. This is the first study in North America in which I. conquisitor and P. facialis were the predominant parasitoids attacking immature A. comptana . In 1987, cumulative percentage parasitism of the first A. comptana generation increased to 7% on 24 June. In 1989, the cumulative percentage parasitism of the first larval generation increased to 5.5% on 23 June. Because strawberries have a relatively high tolerance for A. comptana leaf rolling and feeding activity, naturally occurring parasitoids should be conserved.
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