Aphids can come in an assortment of colors, from green to red and brown to purple. The aphid can damage the leaf and stem of a plant (although some plants do not seem to be affected by their attack). They extract honeydew from the plant which may drip onto plants, patio furniture or other areas near the aphids forage site. This honey dew also attracts wasp, ants or flies to the site. If the honeydew is from an infected tree, there is also a potential of spreading diseases from one tree to another.

Trees and shrubs Attacked: Almost all plants can be attacked by Aphids
Damage to look for : Some plants show no reaction, though others may experience: Leaf curling Stem distortion Swelling of twigs or stems Sooty Mold Gall formations Discoloration of leaves