Environmental Entomology (1993) 22, 679-683

John J. Obrycki, Andrew M. Ormord, Aaron D. Gabriel and Candy J. Orr (1993)
Larval and pupal parasitism of the strawberry leafroller (Lepidoptera: Tortricidae)
Environmental Entomology 22 (3), 679-683
Abstract: Fourteen parasitoid species were recovered from strawberry leafroller, 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation
population dynamics/epizootiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Ancylis comptana	Strawberry (Fragaria)	U.S.A. (mid N)
Itoplectis conquisitor (parasitoid)	Ancylis comptana	Strawberry (Fragaria)	U.S.A. (mid N)
Pediobius facialis (parasitoid)	Ancylis comptana	Strawberry (Fragaria)	U.S.A. (mid N)