Therioaphis trifoliiTherioaphis trifolii, the yellow clover aphid, is a species of aphid in the family Aphididae. It is found in Europe.SubspeciesThese three subspecies belong to the species Therioaphis trifolii:Therioaphis trifolii albae Bozhko, 1959Therioaphis trifolii trifolii Therioaphis trifolii ventromaculata Müller, 1968