Is your tree actually stressed, or just doing what late summer does to trees? Both are common in August. They don’t call for the same response.
Crispy, browned leaf edges show up on a lot of Davis County trees by this point in the season. Most of the time, that’s leaf scorch. Low humidity and intense sun dry out the leaf edges faster than the roots can resupply water. It’s usually temporary, not a sign of a dying tree.
Real tree health problems look different, and they’re worth catching before winter. Here’s how to tell the two apart, and what to do about each.
Reading the Real Warning Signs
Simple leaf scorch stays at the edges of the leaf. It shows up evenly across the canopy. It’s usually worse on the side facing the afternoon sun.
Persistent scorch is different. If the browning keeps getting worse through August, instead of holding steady, that points to something under the surface.
Early leaf drop is one of those deeper signals. A tree dropping green or partially green leaves in August is worth noticing. Beyond the normal light litter, it’s often responding to root stress it can’t otherwise show you.
A thinner canopy than last year is another sign. So is twig growth you can barely measure since spring. Trees put on less new growth when they’re struggling, even if the existing leaves still look fine.
Yellow leaves with green veins are their own specific signal. That pattern usually points to iron chlorosis. It’s common enough in Davis County soil that we’ve covered it separately in our iron chlorosis guide.
Bark tells its own story, especially on young trees. Watch for discolored patches, or cracking. Bark that sloughs off to reveal dead tissue underneath is a clear signal. It shows up most on the south or southwest side of the trunk.
That’s sunscald. Utah’s mix of cold winter nights and unusually sunny days makes it worse here than in cloudier climates.
The south side of a trunk can run more than 70 degrees warmer than the north side. That’s on a clear winter day. The gap is not small.
That swing is what kills bark cells. They warm up during the day, lose their cold tolerance, then get hit by a hard freeze after dark. That combination is what does the damage, not the cold alone.
Young trees with thin bark are the most vulnerable to this. Established trees with thicker, more weathered bark handle the same swing much better. A tree planted in the last two or three years does not.
Two things prevent it. Wrapping the trunk in white tree wrap for winter reflects enough light to keep the bark cooler. Painting the southwest side of the trunk with white interior latex paint does the same thing. Nothing needs removing in spring.
Either approach works. What matters is doing one of them before the first hard freeze. Waiting until damage shows up in spring is too late.
What Actually Helps Before Winter
Utah State Extension is specific about one thing. Stop fertilizing trees for the season.
Late-season fertilizer pushes new growth. That growth doesn’t have time to harden off before cold weather. It makes a tree more vulnerable to winter damage, not less.
Watering matters more than feeding at this point. Trees need deep, infrequent watering, not the frequent shallow watering that keeps a lawn green.
Extension guidance calls for watering trees and shrubs deeply in late fall, before the ground freezes. Dry roots heading into winter are a real risk here.
Mulch helps for the same reason. A layer of wood chips or similar material over the root zone holds soil moisture. It moderates temperature swings at the roots too.
It’s one of the simplest things a homeowner can do with real payoff. No special equipment, no guesswork about timing.
Keep the mulch a few inches deep and pulled back slightly from the trunk itself. Piled directly against the bark, it traps moisture against the trunk instead of the roots. That invites rot instead of preventing stress.
Evergreens carry their own late-season risk. Watch for browning or scorching on the southwest side of needles or leaves over winter.
That pattern is winter desiccation, not disease. The same deep pre-freeze watering that helps deciduous trees also reduces it.
How We Assess Tree Health in Davis County
We’ve been assessing tree health across Davis County since 1981. August calls usually break down the same way.
Most trees showing scorch just need patience and correct watering through the rest of the season. Nothing more.
The ones that don’t are usually telling us something more specific. Chlorosis, root stress from construction or compaction, or a canopy that’s been declining for more than one season.
Construction root stress is easy to miss, because the damage often happens months before the symptoms show up. Trenching for a sprinkler line or grading a driveway can do it. So can heavy equipment parked near the drip line for a few days. None of it looks dramatic at the time.
The tree usually keeps looking fine through the rest of that season on stored energy. The stress shows up the following summer instead. It looks like thinning, early leaf drop, or dieback that seems to come out of nowhere.
If you’ve had recent work done near a tree’s root zone, that history is worth mentioning. It matters more than anything visible on the trunk right now.
For those, deep root feeding delivers nutrients directly into the root zone. That’s different from surface fertilizer, which Utah’s alkaline topsoil often locks up before it ever reaches the tree.
Our deep root feeding guide covers how that process works and when it makes sense.
Not sure whether what you’re seeing is normal late-summer stress or something more serious? That’s what a service call is for. We’d rather confirm it than have you guess.
Our tree and shrub care services cover diagnosis and treatment. Our full season program folds tree care into the same seasonal schedule as your lawn.