The Potato Aphid is pink or green, the latter with a darker stripe down the back. The cornicles are large with black ends. Many ornamentals are susceptible to this aphid. This is a larger species of aphid when considering using biological control. The small parasitic wasp, Aphelinus abdominalis may be used against larger aphid species such as the foxglove and potato aphid.
See the fact sheet: Aphids on Greenhouse Crops