Which species is associated with the dusky-veined aphid?

The dusky-veined aphid is specifically associated with the species Chromaphis juglandicola. This aphid is known for affecting walnut trees by feeding on their sap and can cause damage through the transmission of diseases as well as direct feeding injury.

The other species listed are not directly related to the dusky-veined aphid. Callaphis juglandis, for instance, is related to a different type of aphid affecting walnuts but is not the one referred to as the dusky-veined aphid. Phytophthora spp. refers to a genus of water molds responsible for root rot and other plant diseases rather than being directly associated with aphids. Lastly, Trialeurodes abutilonia is a whitefly species, which is also not linked to the dusky-veined aphid.

Thus, the identification of Chromaphis juglandicola as the dusky-veined aphid is based on its specific impact on walnut health and its recognition in agricultural contexts.