Pine beetles and Emerald Ash Borers (EAB) can both cause serious tree damage, but they target different trees and leave behind different clues. Knowing what to look for can help you spot a potential problem early.
Pine beetles attack pine trees. Common signs include small blobs of resin called “pitch tubes” on the trunk, reddish-brown dust around the bark or base of the tree, small round exit holes, and needles that fade from green to yellow and then reddish brown.
Emerald Ash Borers attack ash trees. Watch for thinning leaves or dying branches near the top of the tree, splitting bark, new shoots growing from the trunk, increased woodpecker activity, and distinctive D-shaped exit holes. Beneath the bark, EAB larvae create winding, S-shaped tunnels as they feed.
If you notice any of these warning signs, don’t assume beetles are the cause. Drought, disease, and other environmental stresses can produce similar symptoms. A certified arborist can identify the problem, evaluate the tree’s condition, and recommend treatment or removal when appropriate.
Early detection matters—so take a moment to check the trees on your property and know what’s bugging them!