A tree is dying, not just stressed, when the crown thins from the top down and the tips inward, when new leaves come in small and pale or not at all by late May, when bark sloughs off in sheets to reveal dry grey wood, or when mushrooms and shelf conks grow at the base. The quick check is the scratch test: scrape a twig and then a larger branch. Green and moist means alive, brown and dry means that part is dead, and how far down the tree you have to go to find green tells you how much is left. In Albuquerque most dying trees are dying of thirst, age, or both, and the ones that actually need to come down are the ones with decay in the trunk and something underneath them.
That matters because of where we live. Albuquerque averages 8.84 inches of rain a year, so every yard tree off the valley floor lives on irrigation. In 2025 and 2026 the metro sat in extreme-to-exceptional drought, the Rio Grande ran dry at Central Avenue for more than 58 days by mid-August 2026, and roughly 1,000 acres of bosque browned within weeks. That is why "is my tree dying" spikes here every spring, when leaf-out shows which trees made it.
Signs of a dying tree: the checklist
One sign is a question; three or more together is a diagnosis.
- Top-down dieback and a thinning crown. A tree with failing roots abandons the top first.
- No leaf-out by late May. Cottonwood, honey locust and pistache leaf out late after a cold spring; bare wood in June is not normal.
- Small, pale, scorched or early-dropping leaves.
- Sticks and twigs everywhere on the ground, on still days as well as windy ones.
- Bark falling off in sheets, vertical cracks, or oozing. Dark, sour-smelling slime flux is common on elms, willows and cottonwoods here.
- Mushrooms or conks at the base or on the trunk, carpenter-ant sawdust, or a hollow sound when you tap the trunk.
- A new lean, cracked or mounded soil, or lifted roots. The root plate has moved.
- Borer holes, sawdust-like frass at the base, or woodpecker flecking. Borers pick trees that are already weak.
Then do the scratch test in order: a twig, a pencil-thick branch, a limb, and the trunk just above the root flare. Green under the bark is alive; brown and dry is dead. Dead twigs over green limbs is a stressed tree. Green twigs over a trunk that scrapes brown or sounds hollow is a tree on borrowed time. Two things that are not death: leaf drop in October and November, and drought-induced early dormancy, where a tree goes bare in August and leafs out again next spring.
Drought stressed trees: how thirst looks in Albuquerque
Thirst is the master stressor here, and it explains most of what people mistake for disease. The mesa soils, Bluepoint-Kokan sand on the West Mesa and Madurez-Wink loamy sand across the East Mesa, hold little organic matter and dry out within days of a watering. ABCWUA's Water Waste Ordinance bans spray irrigation from 11 a.m. to 7 p.m., April 1 through October 31 (drip, bubblers and hand-watering are exempt). The classic slow death is the xeriscape conversion: the lawn sprinklers get capped, gravel goes down, and the 40-year-old ash, elm or cottonwood that drank from that lawn starts dying from the top two summers later.
Drought symptoms are scorched leaf margins, early fall color, small leaves, top dieback and sunscald on thin bark. Drought consequences are worse: Ips and twig beetles in stressed piñon, Austrian and ponderosa pine; cottonwood borer and lilac-ash borer in stressed cottonwood and ash; locust borer in honey locust, all listed in NMSU's H-174 pest guide.
The rescue for a thirsty tree with live buds is slow: deep watering out to the drip line every two to four weeks in the growing season and about monthly through a dry winter, a wide ring of mulch, no fertilizer, no heavy pruning that season. What a homeowner cannot easily tell is thirsty from past saving, which is what a tree health assessment is for: hands on the trunk, a look at the root flare and buds, and a straight answer before money goes the wrong direction.
Cottonwood tree problems: age, water and mistletoe
The Rio Grande cottonwood is the valley's signature tree and its biggest hazard, taller than anything else on the block with a trunk several feet across. Most of the big ones date to the 1941 flood, and at 80 to 100 years they are at the end of their natural lifespan; the shallow aquifer they root into is dropping, and the river no longer spreads across its floodplain the way the species needs. Just upriver on Santa Ana Pueblo, USGS documented about a third of a cottonwood stand dying between 2011 and 2013, with ring growth declining since 1992. Reports from the Albuquerque bosque in 2025 described heavy branch fall and old cottonwoods that did not survive the summer.
Cottonwood-specific signs: top dieback over a green lower crown; sudden limb drop on still, hot days; a hollow trunk (the cottonwood at Corrales Road and Uva Road was about half hollow when MRGCD took it down in September 2022); cottonwood borer tunnels and frass at the base; leaf drop from cottonwood leaf beetle and aphids; and broadleaf mistletoe, the green clumps in a bare winter crown, which NMSU says appears to be spreading further north along the Rio Grande each year. Mistletoe gets blamed for decline in trees that were already old.
Honest management: light mistletoe is cut out well below the swollen attachment, and heavy infestation is handled with crown reduction, not a war on every clump, because aggressive cutting can hurt an old cottonwood more than the parasite does. Dead limbs come out in winter or early spring, when borer adults are inactive. Ditch-bank cottonwoods sit in MRGCD's right-of-way and are not the homeowner's call.
Globe willow tree problems: the 30-year tree
Globe willow, Arizona ash and fruitless mulberry were the fast shade trio planted across the International District, Uptown, Taylor Ranch and the Southeast Heights from the 1950s through the 1980s. Globe willow is the shortest-lived: shallow-rooted, over-watered, weak-wooded and prone to failing at around thirty years. It wind-throws in the March-to-May wind season and splits its multi-stem crown in monsoon outflow, like the 63 mph east-canyon gust of August 8, 2024.
Signs on a globe willow: slime flux weeping dark, sour liquid from the trunk and crotches; crown dieback and sparse leaf; borer holes and sawdust; cracked co-dominant stems; a whole-tree lean after a wet-then-windy week; heavy sucker growth from the base as the top fails. Western tent caterpillar nests in willows too, ugly but rarely fatal.
A declining globe willow over a roof or driveway is usually a removal: the wood is weak, the tree is at the end of its life, and every year it stands it costs more to take down safely. A young one in the open just needs water and a structural prune.
Can a dying tree be saved?
Sometimes. Fixable: drought stress with live buds; iron chlorosis (yellow leaves, green veins) in maples, oaks and sycamores on our alkaline soil; cosmetic defoliators like elm leaf beetle on an irrigated Siberian elm; light mistletoe; a leaning young tree that can be staked. Not fixable: trunk decay with conks; a failed root plate or new lean on a big tree; a trunk girdled or sunscalded more than halfway around; a crown more than half dead after re-leafing; borer-riddled sapwood on an old cottonwood or ash. One note on ash: emerald ash borer has not been confirmed in New Mexico, so an ailing ash here is drought, lilac-ash borer or chlorosis until proven otherwise. Borers and mistletoe are managed, not cured, and nothing revives a rotten trunk.
When a dying tree should come down
Removal is right when more than about half the crown is dead or failed to re-leaf; when there are conks, a cavity or a hollow sound in the trunk or root flare; when a new lean or root-plate movement points at a house, lane, corral or play area; when large deadwood or a dead top hangs over a roof, parking or the PNM service drop; or after repeated limb failures. If a line is involved, PNM goes first through its own channels (PNM disconnects the drop; it does not trim it), and injuries go to 911. Not a removal: seasonal leaf drop, late leaf-out, drought scorch with live buds, a long-standing modest lean with nothing under it, or a big tree that just needs its deadwood out.
Permits: none for a tree wholly on a private city lot, a City Forester permit for the public right-of-way, MRGCD's process for ditch-bank trees. When it is a removal, tree removal of a decayed cottonwood or willow should happen while the wood still holds a rope; dead wood turns brittle fast in this climate. For a tree that is actively failing, Roque Tree Service runs 24/7 emergency service and heads out within about an hour, depending on distance; call (505) 306-2007 and tell us what is failing. Otherwise, a free written estimate starts at /free-estimate.
Corrales: where trees are a civic topic
In Corrales, trees make the front page: a Landmark Tree ordinance since 2006, a Tree Preservation Advisory Committee that warned in March 2021 that Corrales is facing the loss of its cottonwood forest, a public mistletoe-removal demonstration at La Entrada Park on Arbor Day 2022, flowers left on the Uva Road stump. It is a village of one-acre-plus lots, 91 percent owner-occupied, every property on a well and septic, where the cottonwoods, globe willows, Siberian elms and poplars planted in the 1970s through the 1990s now hang over lines and roofs. The February 2023 windstorm, around 70 mph, and the November 6-7, 2024 wet snow on still-leafed cottonwoods showed which trees were already failing, and with the Corrales Siphon ruptured since 2022 and MRGCD running 2026 as a run-of-river season, ditch water is no longer something to count on.
Only formally designated Landmark Trees are protected, but a designated one carries the Village's own rules for who may prune it and how, so check with the Village first; the Bosque Preserve is no-cut, agency-only ground. Fall leaf drop is when mistletoe and deadwood show, and winter is when a boom truck can cross pasture without rutting it. Roque Tree Service has worked Albuquerque and the valley since 2015, licensed (NM license #L1313927408), bonded and insured, with 100% of jobs done by our own crews. Send photos through the estimate form and we will tell you plainly whether the tree is thirsty, dying or dangerous.