Areas of agriculturally used land are steadily increasing and pesticides are commonly used for optimising yield. They are either locally applied on the plant surface or are systemically distributed in the plant. Thus, insecticides can differ in the way they are taken up by insects and do not only harm pest species but also non-target organisms. We investigate the effects of different insecticide-uptake on the development and behaviour of a leaf beetle (Phaedon cochleariae) and whether transgenerational effects can be observed. Furthermore, we study combined effects of insecticide-exposure and parasite infestation of larvae and adults.