Pocket Botanist
Check these first
- Inspect the undersides of the leaves for insects.
- Check if the spots have a yellow halo around them.
- Look for fallen leaves under the tree that show similar spots.
Likely causes
Fungal leaf spot
PossibleHow to tell: Small brown or black spots appear on the leaves, sometimes with a yellow halo. These spots may grow larger and cause the leaf to drop early.
What to do: Rake up and dispose of all fallen leaves to remove fungal spores from the area. Improve air circulation around the tree by pruning crowded branches.
Pest damage
PossibleHow to tell: Tiny yellow or brown spots appear where insects have been feeding on the leaf surface. You might see small bugs or webbing on the underside of the leaves.
What to do: Identify the specific pest and use an appropriate insecticidal soap if needed. Keep the tree healthy with proper watering to help it resist damage.
Find out what's wrong with your american elm
The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
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When to worry
If the spots cover most of the leaf surface and cause significant defoliation, the tree is under stress. A few spots here and there are usually harmless.
Stopping it coming back
Keep the area under the tree clean of debris and ensure the tree has plenty of sunlight and airflow.
American elm: spots? Check yours with a photo
Every plant is a little different. Take a photo of your american elm and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
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Questions people ask
- Should I spray my tree with fungicide?
- Fungicide is rarely necessary for minor leaf spots. Good sanitation and healthy growing conditions are usually enough.
- Will leaf spots kill my American elm?
- Most leaf spot diseases are cosmetic and will not kill a mature tree. They are mostly an issue for young or very stressed trees.
Guides to these causes
More problems with American elm
Back to the American elm guide
This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.