High Quality Content by WIKIPEDIA articles! Acyrthosiphon pisum, commonly known as the pea aphid, is a sap-sucking insect in the Aphididae family. It feeds on several species of legumes (plant family Fabaceae) worldwide, including forage crops, such as peas, clover, alfalfa, and broad beans, and ranks among the aphid species of major agronomical importance. The pea aphid is a model organism whose genome has been sequenced and annotated.