Aphids show inhibition of wing development when parasitized by hymenopteran parasitoids, especially when parasitism takes place early in the host's development. The present study tests the hypothesis that the aphid itself redirects the resources needed for the development of wings to support the immune response, rather than the parasitoid directly promoting wing inhibition. When the aphid's immune system is challenged with bacterial antigens and a fungal pathogen, neither immune challenge alters wing development, indicating that perhaps there is no redirection by the aphid of resources required for wing development to cover possible costs of mounting an immune response.