Trees add beauty, shade, and value to your property. But just like any living organism, they can become vulnerable to diseases—especially in a climate like Massachusetts, where cold winters and humid summers create the perfect conditions for fungal and bacterial infections.
Understanding the most common tree diseases in the region and learning how to prevent them is essential to protect your landscape and avoid costly removals.
In this guide, we’ll explore the main tree diseases in Massachusetts, their symptoms, and practical tips to keep your trees healthy year-round.
Dutch Elm Disease (DED)
One of the most devastating tree diseases in the U.S., Dutch Elm Disease is caused by a fungus spread by elm bark beetles.
Signs to watch for:
Wilting and yellowing leaves, starting from the upper branches.
Brown streaks under the bark.
Progressive dieback of limbs.
Prevention tips:
Hire a professional arborist for preventative fungicide treatments.
Prune infected branches early to stop the spread.
Keep trees healthy with proper watering and fertilization.
2. Anthracnose
A common fungal disease that affects many hardwood trees such as oak, maple, and sycamore.
Signs to watch for:
- Brown or black spots on leaves.
- Curling or early leaf drop.
- Twig and shoot dieback in severe cases.
Prevention tips:
Ensure proper spacing between trees to minimize moisture buildup.
Rake and dispose of fallen leaves to reduce fungus spores.
Prune affected branches to increase air circulation.
3. Apple Scab
Although it mostly affects crabapple trees, Apple Scab is widespread across Massachusetts and can weaken trees if left untreated.
Signs to watch for:
- Olive-green or brown spots on leaves.
- Premature leaf drop in spring or early summer.
- Dark, scabby lesions on fruits.
Prevention tips:
- Plant disease-resistant crabapple varieties.
- Remove and destroy infected leaves.
- Apply fungicides in early spring if necessary.
