Lupin aphid is present on its host plants all year round.
Small numbers of aphids overwinter on the basal buds and they begin to reproduce in spring. For most of spring and summer the aphids are in the form of wingless females that give birth to live young. Aphid numbers generally peak when the plants are coming into flower.
When the aphids colonies become overcrowded in mid-summer, winged forms develop that can fly and colonise other lupins.