none Pieris brassicae; AGE-; Dispersal success relationship; FOOD-PLANTS; Brassica oleracea (Brussels sprouts); Costs & benefits for larvae of egg clustering; FOOD-AVAILABILITY; FORAGING-; Food plant location ability; EGG-; Clustering; HYMENOPTERAN-PARASITES; Cotesia glomerata; Prevalence; MORTALITY-; Rate for larvae, food plant; POPULATION-DENSITY; Larvae, effects on survival rate & food plant, egg clustering significance; DISTRIBUTION-WITHIN-HABITAT; Larval dispersal success, influencing factors; ENGLAND-; Silwood Park; Egg clustering, costs & benefits for larvae, analysis of larval dispersal Cotesia glomerata; LEPIDOPTERAN-HOSTS; Pieris brassicae; Egg clustering significance, food plant; ENGLAND-; Silwood Park; Prevalence, egg clustering by lepidopteran host significance