Trees are a major part of the landscape here in Delaware County, offering beauty, shade, and value to your property. But like any living thing, they’re susceptible to disease—especially in our Mid-Atlantic climate. Early detection and treatment can save your trees and prevent costly removal. Here are the top three tree diseases affecting our area and what you can do about them:
1. Anthracnose (Common on Sycamore, Ash, and Dogwood Trees)
Symptoms: Curling or browning leaves, early leaf drop, and dark blotches along veins.
Why It Matters: While not always fatal, repeated infections can severely weaken your tree.
What to Do: Prune infected branches and improve airflow. Fungicide treatments are effective when applied early.
2. Beech Leaf Disease (Emerging Threat in PA)
Symptoms: Dark banding between leaf veins, curled or leathery leaves, and stunted growth.
Why It Matters: This relatively new disease can kill beech trees within a few years.
What to Do: While research is ongoing, early detection is key. Professional soil treatments and care can slow the progression.
3. Oak Wilt (Fast-Acting and Fatal)
Symptoms: Sudden leaf wilting, leaf drop from the top down, and discoloration in the vascular system.
Why It Matters: Oak wilt spreads quickly and can kill a healthy oak in one season.
What to Do: Immediate action is required. Avoid pruning oaks in spring/summer and call a certified arborist at the first sign.
Don’t Wait Until It’s Too Late
Tree diseases can escalate quickly, especially in the warm, humid months. If you notice any of these warning signs in your yard, it’s time to bring in an expert. Our certified arborists offer tree health evaluations, treatment plans, and disease prevention tailored for Delaware County landscapes.