Common Indiana Tree Diseases and How to Spot Them

Posted by Mid Western Tree Experts | Indianapolis, IN

Trees in Indiana face a variety of threats throughout the year, from harsh weather to invasive pests. But one of the most persistent and destructive dangers is disease. If left unchecked, these illnesses can weaken or kill even the healthiest trees—posing a risk to your property and safety. This guide will help you identify common tree diseases in Indiana and show you what signs to watch for.

🌿 Why Tree Disease Awareness Matters

Early detection is critical. Identifying symptoms before they spread allows you to take action—whether it’s targeted treatment or timely removal. Keeping your landscape healthy starts with knowing what to look for.

🦠 1. Anthracnose

• Trees affected: Sycamores, Oaks, Maples
• Symptoms: Brown or black blotches on leaves, early leaf drop, dead twigs
• What to do: Prune infected areas; improve air circulation; consider fungicide if severe

🌳 2. Verticillium Wilt

• Trees affected: Maples, Redbuds, Catalpas, Elms
• Symptoms: Wilting or yellowing leaves, branch dieback, dark streaks in sapwood
• What to do: Remove infected limbs; avoid high-nitrogen fertilizer; no cure, but healthy maintenance helps

🍄 3. Root Rot (Phytophthora)

• Trees affected: Many species, especially in poorly drained soil
• Symptoms: Poor growth, yellowing leaves, soft or decaying roots
• What to do: Improve soil drainage; remove severely infected trees

🍁 4. Tar Spot

• Trees affected: Primarily Maples
• Symptoms: Raised, tar-like black spots on leaves
• What to do: Rake and remove fallen leaves to prevent spread; usually cosmetic

🐛 5. Fire Blight

• Trees affected: Crabapples, Pears, Hawthorns
• Symptoms: Shoots appear scorched; blackened blossoms; “shepherd’s crook” branch tips
• What to do: Prune during dry weather; sanitize tools; remove infected areas quickly

🛠️ Prevention Tips

• Water deeply, not frequently
• Avoid over-fertilizing
• Prune regularly and correctly
• Hire certified arborists for inspections

👷‍♂️ Get a Tree Health Check

At Mid Western Tree Experts, we provide disease diagnosis, safe treatment options, and removal if necessary. If you notice anything off about your trees—discoloration, dropping leaves, or strange growths—call us right away.

📞 Call (317) 578-0690 or schedule an inspection online.