Omaha symptom guide
Why Are My Tree’s Leaves Turning Yellow, Brown, or Dropping Early?
Leaf discoloration and early drop can follow soil moisture, high-pH site conditions, root stress, weather, insects, disease, or chemical injury. The pattern and recent site history matter more than color alone.
What this page is for
Organize the observation before choosing action
Help an Omaha homeowner document the pattern and choose between monitoring, species context, and having Andrew look at the tree.
This page does not identify the cause, recommend chemical treatment, or determine that pruning or removal is needed.
What to notice
- Notice whether the change is on one branch, one side, scattered through the canopy, or the whole tree, and whether other kinds of plants nearby show the same thing.
- Record recent rain, irrigation changes, dry soil, drainage, construction, grade changes, and chemical use.
Plausible categories to compare
These are not ranked probabilities and do not form a diagnosis.
Water or soil conditions
Both dry and overly wet soil can stress trees, and Nebraska soil texture changes how quickly moisture moves.
Root or planting-site stress
Planting depth, compaction, drainage, root disturbance, and high pH can produce yellowing and decline.
Pest, disease, or chemical injury
Insects and diseases usually affect one kind of plant and show up unevenly, while chemical and other nonliving injury tends to be uniform and can affect several kinds of plants at once.
What to document from the ground
- whole tree and surroundings
- full canopy pattern
- front and back of affected leaves
- soil and root-flare area
- recent weather, watering, construction, and chemical history
Safety boundary
If discoloration accompanies a hanging limb, split trunk, new lean, lifted soil, or power-line conflict, stop here and use the Hazard Assessment.
Use the Hazard AssessmentRelated named references
These names are useful for further research, not confirmation of what is affecting a specific tree.
Sources
- Nebraska Forest Service: Tree Care Basics: Finding the Root of the ProblemNebraska
- Nebraska Forest Service: When to Water TreesNebraska
- Nebraska Forest Service: How to Water Mature Trees During Hot, Dry WeatherNebraska · 2026-07-10
- Nebraska Forest Service: Care of Newly Planted TreesNebraska
- Nebraska Extension: Common Signs and Symptoms of Unhealthy Plants (EC1270)Nebraska · 2014-01-14
- Nebraska Forest Service: Selecting Trees for TreatmentNebraska
- Omaha Public Power District: Distribution Lines and Trees FAQNebraska