White Pine Weevil: Why the Top of Your Pine Wilted and How to Fix It
A drooping, dying topmost shoot — bent over like a shepherd's crook — is the unmistakable signature of the white pine weevil, the single most damaging pest of Eastern white pine. It rarely kills the tree, but it can ruin the straight central leader and leave a forked, crooked top. Here's how to recognize it, what's behind it, and how to keep your tree's form.
White pine weevil (the classic cause)
What's happening
An adult weevil lays eggs in the previous year's leader in early spring. The grubs tunnel down inside the topmost shoot, girdling it from within. The leader wilts, curls into a tell-tale "shepherd's crook," and dies, usually noticed in early summer.
How to confirm
Look at the very top of the tree: the current leader is wilted, browning, and bent over in a hook while the rest of the tree stays green. Small resin droplets or tiny exit holes may dot the dead shoot, and peeling the bark reveals tunnels or pale, legless grubs inside.
How to fix it
Prune out the dead leader well below the damaged section — down into healthy wood — as soon as you spot it, and destroy or bag the prunings to kill the grubs inside. Then train the strongest single side shoot upright and stake it vertically to become the new leader; rub off competing shoots so the tree doesn't fork.
Prevent it
Site trees in some light shade or mixed plantings (the weevil favors open-grown, sun-warmed leaders), inspect leaders each spring, and remove and destroy any infested shoots promptly before the new adults emerge.
Letting a fork or double leader develop
What's happening
After the leader dies, two or more side shoots often race upward together. If you don't choose one, the tree forms a permanent fork or candelabra top — weak, crooked, and prone to splitting in storms.
How to confirm
Two or more shoots of similar length are growing upright from where the old leader died, none clearly dominant, and the top of the tree looks Y-shaped or multi-stemmed.
How to fix it
Pick the straightest, strongest upright shoot, stake it vertical, and cut the competitors back to a side branch or remove them entirely so a single leader re-establishes.
Prevent it
Each spring after a weevil hit, re-check the top and keep selecting for one dominant leader until the tree has clearly recovered a single straight stem.
Bark beetles or borers in stressed wood
What's happening
On trees already weakened by drought, salt, or transplant stress, secondary bark beetles and borers can attack shoots and stems and cause similar dieback that's easy to confuse with weevil damage.
How to confirm
Dieback isn't limited to the topmost leader — you see scattered dead branches, sawdust-like frass, pitch tubes, or small round exit holes lower on the trunk and limbs, often on a tree that's been visibly stressed.
How to fix it
There's no cure once borers are inside; prune out and destroy affected wood and, most importantly, relieve the underlying stress — water deeply and consistently and remove salt or pollution sources so the tree can defend itself.
Prevent it
Keep the tree vigorous with deep watering through drought, a healthy mulch ring, and protection from de-icing salt; healthy white pines resist these secondary pests.
When to worry (and when not to)
A single weevil-killed leader is a cosmetic and structural problem, not a fatal one — the tree almost always survives, and prompt pruning plus training a new leader restores a respectable form within a few years. Worry, and look harder, if the dieback spreads beyond the top into multiple branches, if you see borer frass or pitch tubes lower on the trunk, or if the tree is also salt- or drought-stressed — those signs point to deeper trouble that needs the underlying cause corrected, not just the top pruned.