Parasitism of leafrollers in Washington fruit orchards is enhanced by perimeter plantings of rose and strawberry

► Rosa woodsii gardens supported overwinting of mature Ancylis comptana larvae. ► The parasitoid Colpoclypeus florus used A. comptana larvae as overwintering host. ► Positioning rose plantings next to orchards increased parasitism by C. florus. ► Movement of C. florus from roses into an orchard was tracked by protein marking.