Aphids
migrating to their winter host plant in autumn, where they reproduce sexually and lay eggs that overwinter. The summer host plants are either herbaceous or woody [...] Aphids that do not alternate between host plants also mate in the autumn and lay eggs which overwinter. Where mating occurs and eggs are laid, the life cycle [...] (complete). In greenhouses, however, the alternation of host plant and egg-laying may not take place. In this case, reproduction continues through the winter