none2000 Techniques; Collecting techniques; Behaviour; Communication; Chemical signals; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Habitat; Man made habitat; Land and freshwater zones; Palaearctic region; Europe Hymenoptera; Trapping; Water trapping; Hemipteran host sex pheromone & plant allelochemical baited traps, capture rate; Hemipteran hosts; Aphidiidae; Host sex pheromone & plant allelochemical effects on parasitoid behaviour; United Kingdom; Great Britain; Rothamsted; Hemipteran host sex pheromone & plant volatile effects on behaviour, preliminary trapping study Aphidiidae; Pheromones; Sex pheromones; Hymenopteran parasites; Host sex pheromone effects on parasitoid behaviour, preliminary trapping results; Plant hosts; Cruciferous plants; Cultivated land habitat; Cruciferous crops; United Kingdom; Great Britain; Rothamsted; Sex pheromone & plant volatile effects on hymenopteran parasitoid behaviour, preliminary study