| Heavy aphid infestations, lacking predator activity, may warrant rescue treatment. |
| The Russian wheat aphid is a major pest of winter wheat and barley in the United States and worldwide. |
| The current threshold for late vegetative beans with actively increasing aphid populations is 250 aphids per plant. |
| Spiny brown growths resembling hollow cones that form at branch tips on Colorado spruce are caused by an insect called Cooley spruce gall aphid. |
| The aphid feeds within the whorl of the upper leaves, causing the leaf to remain tightly rolled. |
| Studies of other aphid species have reported that pods are higher quality plant food than leaves. |
