Acyrthosiphon gossypii, the melon aphid or cotton aphid, is an aphid in the superfamily Aphidoidea in the order Hemiptera. It is a true bug and sucks sap from plants. It is found from India, Sri Lanka, Cameroon, and South Africa.
Normally host in Sesbania grandiflora.
It is known to be a major insect pest on cotton plants and melon fruits.