Why are the branches at the top of my tree dying?
Bare or sparse branches at the very top of the crown while the lower canopy still looks reasonably full — the stag-headed silhouette.
Not an emergency this afternoon, but the window for a useful response is measured in weeks. Left alone, most of these get more expensive rather than less.
Dieback that starts at the top is the tree telling you it can no longer supply its furthest tissue, and that points at the roots or the plumbing rather than at the branches themselves. On an ash in Kansas, treat it as emerald ash borer until proven otherwise and act this season — treatment windows close as the canopy thins, and there is a point past which no product will save the tree.
What this looks like
The outline of the tree changes before anything else does. Dead twigs and small branches at the top hold no leaves and stand out against the sky like antlers, and the live canopy retreats downward year over year. On ash, the trunk and larger limbs often sprout dense tufts of new growth low down at the same time, which reads as vigor but is the opposite: it is the tree trying to rebuild a canopy from wherever it still has working tissue.
- Dead, leafless twigs and branch tips concentrated in the upper third of the crown
- Vigorous sprouts erupting from the trunk and lower limbs while the top declines
- Vertical splits in the bark of the trunk and major limbs, sometimes with S-shaped tunnels visible underneath
- Patches of bark scaled off by woodpeckers, leaving pale, blond wood exposed
What causes it in Kansas
Roughly in order of how often each turns out to be the answer here. The line under each one is what separates it from the others — open a cause for the detail.
1Emerald ash borer
How to tell: The tree is an ash, top dieback appeared over one or two seasons, and you can find eighth-inch D-shaped exit holes, bark splits, or heavy woodpecker feeding.Confirmed in Kansas since 2012 and now widespread across the eastern half of the state. Larvae feed in the layer just under the bark, cutting the tree's supply lines from the top down. Untreated ash die — the question is when, not whether.
2Root damage and compaction
How to tell: The dieback appeared gradually, no borer signs are present, and there was excavation or construction near the tree in the last five years.The top of a tree is the hardest place to move water to. When a root system is reduced by trenching, paving, grade change, or compaction, the crown dies back from the furthest point inward.
3Drought stress carried forward
How to tell: Multiple mature trees in the area declining together on the same schedule.A hard dry summer shows up as top dieback in the following year or two, especially in trees with restricted root space or shallow soil over clay.
4Other borers in stressed trees
How to tell: Round or oval holes with coarse sawdust, on a tree that had visible problems before the holes appeared.Flatheaded borers, ash and lilac borers, and roundheaded borers attack trees already weakened by drought, sunscald, or transplant stress. They accelerate an existing decline rather than starting it.
5Oak decline and vascular disease
How to tell: Rapid wilting and leaf drop through summer on a red oak points to wilt; slow retreat of the crown over years points to decline.In oaks, top dieback follows repeated stress from drought and defoliation, sometimes with root pathogens involved. Oak wilt is a separate and faster problem, killing red oaks over a single season.
6Lightning
How to tell: A vertical scar or torn strip running down the trunk, and dieback that appeared abruptly after a specific storm.A strike can kill the top of a tree while leaving most of the trunk alive, often with a long strip of bark blown off down one side.
What to do, and what to avoid
Safe to check yourself
All from the ground — no ladder, no saw.
- Identify the tree first — if it is an ash, everything about the timeline changes
- Scrape a dying twig with a thumbnail: green underneath means live tissue, tan or brown means it is gone
- Look for D-shaped exit holes about an eighth of an inch across, and for bark splits with winding tunnels beneath
- Estimate the percentage of the crown affected, since ash treatment decisions hinge on that number
What not to do
The responses that make this one worse or permanent.
- Do not begin an expensive treatment program on an ash that has already lost more than a third of its canopy — the outcome rarely justifies it
- Do not top a declining tree to 'reduce the risk'; it removes the healthy lower canopy and creates weakly attached regrowth
- Do not prune oaks between April and July in Kansas, when fresh wounds attract the beetles that spread oak wilt
- Do not move ash firewood between counties, which is the fastest way the borer travels
When to contact an arborist
Whatever this narrows it down to, the assessment that decides what happens next has to happen at the tree. Why that is
Common questions
Is it worth treating my ash?
Is it worth treating my ash?
It depends on the tree, not the species. A structurally sound ash with more than two-thirds of its canopy intact, in a spot where a replacement would take thirty years to match it, is a defensible investment — knowing that treatment is a permanent commitment repeated every one to three years. A declining or poorly placed ash is usually better replaced.
What are the sprouts on the trunk?
What are the sprouts on the trunk?
Epicormic shoots, growing from dormant buds under the bark. They appear when the tree loses canopy or is severely stressed, and they signal trouble rather than recovery. They are also weakly attached, which matters as they get larger.
Can I just cut off the dead top?
Can I just cut off the dead top?
Removing deadwood is good practice and reduces what can fall, but it treats the symptom. If the cause is a borer or root loss, the dieback continues below wherever you cut. Find the cause first, then prune.
Kansas Tree Guide is an independent educational resource. Nothing on this site replaces an on-site assessment by a qualified arborist or tree-care professional. Last reviewed August 2026.
Often seen alongside this
A second symptom narrows the cause faster than more detail about the first.
Not what you are seeing? Work the symptom guide again.