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Check these first
- Inspect the branches for uneven yellowing.
- Check the soil pH level.
- Look for streaks under the bark of dying limbs.
Likely causes
Verticillium wilt
Most likelyHow to tell: You will notice yellowing or browning on one side of the tree or specific branches while the rest looks fine. If you peel back the bark on a dying branch, you might see green or brown streaks in the wood.
What to do: Prune out the affected branches well below the damage, sterilizing your tools with alcohol between every cut. Keep the tree well watered and fertilized to help it fight the infection, but know there is no cure.
Iron chlorosis
PossibleHow to tell: The leaves turn yellow while the veins remain green. This usually happens in soils with a high pH level.
What to do: Test your soil pH and aim for a range of 6.0 to 7.0. Apply a chelated iron supplement to the soil or as a foliar spray to help the tree absorb nutrients.
Find out what's wrong with your sugar maple
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 yellowing is localized to one branch, it is likely a serious fungal issue. General yellowing in late autumn is just the tree preparing for winter.
Stopping it coming back
Keep your tree healthy with consistent watering and avoid wounding the trunk with lawn equipment.
Sugar Maple: yellow leaves? Check yours with a photo
Every plant is a little different. Take a photo of your sugar maple 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
- Can I save a tree with Verticillium wilt?
- You can often prolong its life with good care, but the fungus stays in the soil and the tree will likely continue to decline.
- Is yellowing always a disease?
- No, it can also be a sign of nutrient deficiency or poor drainage.
Guides to these causes
More problems with Sugar Maple
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.