Tan aphid mummies of walnut aphid, Chromaphis juglandicola, each containing an immature parasitic wasp, Trioxys pallidus. The center aphid is not yet mummified, but is discolored because it contains a mature wasp larva partly visible through the aphid's covering.
Tan aphid mummies of walnut aphid, Chromaphis juglandicola, each containing an immature parasitic wasp, Trioxys pallidus. The center aphid is not yet mummified, but is discolored because it contains a mature wasp larva partly visible through the aphid's covering. Credit: Jack Kelly Clark
