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Thirty sites of managed and native habitats were surveyed for leafrollers (Lepidoptera: Tortricidae) in the apple producing region of central Washington State and northern Oregon from September through November 1997–2000 to discover species that supported overwintering by the parasitoid  Colpoclypeus florus  (Walker) (Hymenoptera: Eulophidae).  C. florus,  a species introduced from Europe, requires medium to large host larvae late in autumn on which to overwinter, and few leafroller species display this biology. Over the four years, five potential  C .  florus  hosts were collected, including:  Ancylis comptana  (Froelich),  Xenotemna pallorana  (Robinson), and  Syndemis  sp. (Tortricidae),  Filatima  sp. (Gelechiidae), and  Caloptilia burgessiellia  (Zeller) (Gracillariidae). Of these,  A. comptana, Syndemis  sp., and  Filatima  sp. have been confirmed as overwintering hosts for  C .  florus.  During the four years, the  Syndemis  sp. was rare and observed at only one location feeding on redosier dogwood,  Cornus sericea  L. (Cornales: Cornaceae) although, at this location, many of the larvae collected were parasitized by  C. florus. Filatima  sp. was common in the Yakima valley feeding on balsam poplar,  Populus balsamifera  L. ssp.  trichocarpa  (Torr. & Gray ex Hook) Brayshaw (Malpighiales: Salicaceae) but was rarely parasitized.  A. comptana,  however, was collected at many locations in central Washington and was frequently found as an overwintering host for  C. florus. A. comptana  was found feeding on two Rosaceae: Wood's rose,  Rosa woodsii  Lindl., and strawberry,  Fragaria ananassa  Duchesne (Rosales: Rosaceae). Based on the number of host larvae collected,  A. comptana  appears to be the primary overwintering host for  C .  florus  in Washington. Introduction of  A. comptana  populations to near-orchard habitats may facilitate biological control of leafrollers that are orchard pests.

journal of insect science

Overwintering Hosts for the Exotic Leafroller Parasitoid,<i>Colpoclypeus florus</i>: Implications for Habitat Manipulation to Augment Biological Control of Leafrollers in Pome Fruits

Overwintering Hosts for the Exotic Leafroller Parasitoid,Colpoclypeus florus: Implications for Habitat Manipulation to Augment Biological Control of Leafrollers in Pome Fruits