Should I use a fungicide?

Fungicides are rarely necessary for established trees. Good sanitation and tree health are usually enough to manage these issues.

Will these spots kill my tree?

No, most leaf spot diseases are aesthetic. They rarely impact the overall health of a mature Pin Oak.

What are these spots on my Pin Oak leaves? Causes and fixes

Check these first

Examine the spots to see if they are fuzzy or have a distinct border.
Check if the spots are appearing on new or old growth.
Look for fallen leaves under the tree.

Likely causes

Anthracnose
Most likely
How to tell: Small, irregular brown or black spots appear on the leaves, often along the veins. In severe cases, the leaves may curl or drop early.
What to do: Rake up and dispose of all fallen leaves in the autumn to remove fungal spores. Prune out any dead or crossing branches to improve air circulation through the canopy.
Leaf blister
Possible
How to tell: Raised, circular, yellowish or brown spots appear on the leaf surface. These are caused by a fungus that thrives in cool, wet spring weather.
What to do: This is mostly cosmetic and rarely harms the tree long term. Focus on keeping the tree healthy with proper watering and mulch.

Leaf spots on other plants

Find out what's wrong with your pin oak

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.

When to worry

Worry if the spotting leads to significant early leaf drop or covers most of the canopy. Most leaf spots are harmless and appear late in the season.

Stopping it coming back

Keep the area under the tree clean of debris to prevent spores from overwintering. Water at the base of the tree rather than overhead to keep foliage dry.

Pin oak: spots? Check yours with a photo

Every plant is a little different. Take a photo of your pin oak 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.

Get the app · Or check it from a photo now, free

Questions people ask

Should I use a fungicide?: Fungicides are rarely necessary for established trees. Good sanitation and tree health are usually enough to manage these issues.
Will these spots kill my tree?: No, most leaf spot diseases are aesthetic. They rarely impact the overall health of a mature Pin Oak.

Guides to these causes

Anthracnose

What are these spots on my Pin Oak leaves?

Check these first

Not sure what's wrong with your pin oak?