Pieris rapae; HYMENOPTERAN-PARASITES; Cotesia glomerata; Parasite behavioural variation & selection, cultivated/wild sites; RIPARIAN-HABITAT; Streamside; CULTIVATED-LAND-HABITAT; Cabbage fields, hymenopteran parasite behavioural variation; Parasite fitness implications, cultivated habitat comparisons; NEW-YORK; Geneva & Ithaca; Hymenopteran parasite behavioural variation & selection, wild/farmed sites Cotesia glomerata; FORAGING-; Lepidopteran host parasitization behaviour; Variation in wild vs cultivated habitats; EVOLUTIONARY-ADAPTATION; Wild & cultivated habitats; Behavioural variation & selection relations; NATURAL-SELECTION; Fitness, behavioural variation relationships; Wild vs agricultural sites, greenhouse trials; BEHAVIOURAL-VARIATION; Diversification in agricultural vs wild habitats; Fitness implications; LEPIDOPTERAN-HOSTS; Pieris rapae; Parasite behaviour variation & fitness, wild vs cultivated sites; RIPARIAN-HABITAT; Streamside; Agricultural habitat comparisons; CULTIVATED-LAND-HABITAT; Cabbage fields, behavioural diversification & selection; Wild habitat comparisons; NEW-YORK; Geneva & Ithaca; Behavioural variation & fitness, wild/cultivated sites