What is a common symptom of Emerald Ash Borer infestations?

Upper crown dieback is a common symptom of Emerald Ash Borer infestations. As the larvae of the emerald ash borer feed beneath the bark of ash trees, they disrupt the tree's ability to transport nutrients and water. This feeding can lead to significant stress on the tree, particularly evident in the upper canopy, which may result in the dieback of branches and leaves. This symptom indicates that the tree is unable to sustain healthy growth and is responding to the stress of the infestation.

Other symptoms of Emerald Ash Borer infestations can include the presence of woodpecker activity, D-shaped exit holes in the bark, and a general decline in overall tree health. However, the specific dieback in the upper crown is particularly characteristic of the damage caused by these pests.