4.Damage 1)Plant Sap Sucking Aphids which do this are the most common and destructive of pest insects.A wide variety of economically important plants are attacked. Aphids feed by sucking sap from their hosts.Heavy infestations on some hosts may result in wilting.Young plants may have reduced or stunted growth.4. Damage 1) Plant Sap Sucking Aphids which do this are the most common and destructive of pest insects. A wide variety of economically important plants are attacked. Aphids feed by sucking sap from their hosts. Heavy infestations on some hosts may result in wilting. Young plants may have reduced or stunted growth