Bacterial Leaf Scorch (BLS) is a serious and often overlooked tree disease that affects a variety of shade trees across the eastern and southern United States. Caused by the bacterium Xylella fastidiosa, BLS can lead to long-term decline and even death if left unmanaged. Understanding the signs, risks, and management strategies can help you protect the health and beauty of your trees.
What Is Bacterial Leaf Scorch?
BLS is a systemic disease that blocks the water-conducting vessels of trees, leading to scorch-like symptoms on the leaves. Unlike drought stress, the damage is caused by a bacterial infection that spreads slowly throughout the tree over time.
Trees Commonly Affected by BLS:
If you have any of these species on your property—especially oaks—they may be at higher risk.
Symptoms to Look For:
- Leaf margins turning brown or scorched while veins stay green
- Symptoms usually start in late summer or early fall
- Affected branches may appear randomly across the canopy
- Leaves drop prematurely
- Decline worsens over several seasons
Because these symptoms can mimic drought or heat stress, it’s important to have a professional diagnosis to confirm BLS.
How Does BLS Spread?
The earlier BLS is detected, the better chance you have at managing its spread. If you suspect your tree is showing signs of decline, don’t wait.
The disease is transmitted by sap-feeding insects like leafhoppers and spittlebugs. Once infected, a tree cannot be cured—but with proper care, its life can often be extended.
What You Can Do
While there is no known cure for BLS, strategic management can slow its progression and prolong the life of your tree. Options include:
- Regular Monitoring – Annual inspections by a certified arborist
- Selective Pruning – Removing affected limbs to reduce bacterial load
- PHC Programs – Boosting overall tree health through deep root fertilization and soil care
- Injections – In some cases, trunk injections may suppress symptoms
Early Detection is Key
The earlier BLS is detected, the better chance you have at managing its spread. If you suspect your tree is showing signs of decline, don’t wait.
We’re Here to Help
At Princeton Tree Care, we specialize in tree health diagnostics and long-term care solutions. If you’re concerned about BLS or want to set up a preventative care plan, schedule a consultation with one of our certified arborists today.
📞 Call us or 📩 book a consultation online. Let’s work together to preserve the health of your trees.