Tree Health & Disease Treatment in Wilmington, DE

The emerald ash borer situation in New Castle County has been unfolding since the pest was first detected in Delaware in the late 2000s. By now, the infestation is established in essentially every zip code in the county, which means every untreated ash tree is at ongoing risk. The beetle's impact is slow at first — the canopy thins from the top down over 3–5 years — which makes it easy to underestimate until the tree is beyond treatment. If you have ash trees on your property that haven't been assessed, schedule that evaluation. The cost of proactive trunk injection ($150–$400 per tree every 2–3 years) is a fraction of the cost of removing a large dead ash, and far less than the emergency response after one fails on a roof.

Beyond the headline pests, New Castle County trees face a range of fungal and bacterial issues that are easier to miss. Hypoxylon canker — a fungal pathogen that colonizes stressed oaks and produces distinctive gray-brown lesions on bark — is almost always a sign of serious decline that won't respond to treatment. Anthracnose causes leaf scorch and dieback in sycamores, maples, and dogwoods and looks alarming, but rarely kills otherwise healthy trees. Bacterial leaf scorch in oaks can mimic drought stress and goes undiagnosed for years. We identify what's actually wrong rather than treating generic symptoms — which saves both trees and money in the long run.