It’s unsettling to see the leaves on your previously healthy-looking trees turning yellow and falling off in summer. Arborists consider these issues as tree stress symptoms that need attention.
Blade Runner Tree Service is the leading provider of expert tree services in Hays County, Texas. We’d like to help property owners understand and respond to this common but concerning issue.
What Causes Tree Leaves To Yellow and Drop During the Growing Season?
Tree leaves turning yellow and falling off in summer is not normal. It’s a red flag that your tree may be under stress from one or more environmental or physiological issues.
1. Heat and Drought Stress: A Survival Response
Extended heat and drought take a serious toll on Texas trees. Many species begin to shed leaves as a survival method. Jettisoning leaves is necessary to reduce extreme water loss, so it’s always a signal of distress in the growing season.
You might see:
- Leaves turning yellow or tan with minimal spotting
- Wilting, browning edges, or scorched tips
- Thinning canopies in newly planted trees or species like tulip poplars
This sort of hot weather damage is especially common in trees with shallow or underdeveloped roots.
2. Nutrient Deficiency in Trees: The Science Behind Yellowing
Arborists use the term “chlorosis” to describe a tree’s stress response to reduced chlorophyll production. Yellowing leaves are the typical first warning sign. In our part of Texas, the problem often stems from a serious iron or nitrogen deficiency.
Here’s how to recognize chlorosis in trees:
- Iron deficiency shows up as yellow leaves with green veins (interveinal chlorosis), typically on the newest leaves.
- Nitrogen deficiency causes uniform yellowing on older leaves.
- A high soil pH (which often runs above 7.0 in our region) limits micronutrient availability.
Without an expert’s input, these deficiencies can weaken your tree long-term.
3. Pest and Disease Trouble: A Hidden Threat
Aphids, mites, or scale insects sap a tree’s energy, leading to yellowing tree leaves and premature drop. Meanwhile, diseases such as oak wilt or fungal infections may be the hidden force behind declining tree health.
Watch for:
- Sticky residue from pests
- Leaf spots, blotches, or browning
- Bark splitting or signs of fungus near the trunk
4. Environmental Stressors
Soil compaction from heavy foot traffic or nearby construction can block oxygen from reaching the roots. Poor drainage can drown them. Even herbicide drift from neighboring properties can result in curling or yellowing.
Turn To the Experts With Blade Runner Tree Service Before Summer Leaf Drop Spreads
It’s tempting to treat yellowing leaves with fertilizer or more water, but without a proper diagnosis, you could quickly do more harm than good. Call on the certified arborists from Blade Runner Tree Service to determine the reasons for your tree leaves turning yellow and falling off in summer. Our team can develop a tailored treatment plan designed for your tree species and site conditions.
If you think you’re seeing signs of a dying or dead tree, don’t guess; get accurate answers, and take action. Call Blade Runner Tree Service at (512) 222-2200 to schedule service.