About the aphid
About the photos
In several of the shots, cast skins (exuviae) of molting aphids are visible. These white or grey exuviae are sometimes confused with either live or dead whole aphids, but are simply an indicator that aphids are or were recently present. Most if not all aphids (I cannot remember if there are exceptions right now) molt four times between birth and adulthood, so often there are as many or more of these cast skins on infested plants as there are live aphids.