none Behaviour; Activity patterns; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Land and freshwater zones; Nearctic region; North America; Canada Plutella xylostella (Yponomeutidae); Hymenopteran parasites; Diadegma insularis & Microplitis xylostella; Dates of first occurrence of parasites, spring; Saskatchewan, dates of first occurrence Microplitis xylostella?? (Braconidae ); Diadegma insularis (Ichneumonidae ); Seasonal activity; Lepidopteran hosts; Plutella xylostella; Dates of first occurrence of parasitized hosts; Saskatchewan; Dates of first occurrence of parasitized lepidopteran hosts