Leafroller parasitism across an orchard landscape in central Washington and effect of neighboring rose habitats on parasitism

Parasitism of sentinel leafroller larvae of null Pandemis pyrusana null and null Choristoneura rosaceana null (Tortricidae) was measured in apple, pear and cherry orchards within a 680 ha landscape mosaic in south-central Washington in 1999–2000. Average seasonal rates of parasitism of sentinel larvae were 12% in spring and 29.6% in summer corresponding to the overwintering and summer larval cohorts of pest leafroller generations. Tachinidae...