Tree problems · Other damage
Iron Chlorosis: signs and what to do
Iron Chlorosis is a kind of non-living (abiotic) damage, often seen on maples, pin oak and red oaks, river birch. Look for: leaves that turn pale yellow or light green while the veins stay dark green.
General information, not a diagnosis. A certified arborist or your county extension office can confirm.
- Other damage
- Maples
- Pin oak and red oaks
- River birch
- Bald cypress
- Sweetgum
- Dogwood and magnolia
Signs to look for
Tick what you see. More ticks make it more likely, but only an on-site look can confirm.
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Season
Most visible in spring and early summer when new leaves come out. It can show all season in alkaline soil.
How it spreads
Iron chlorosis does not spread. It is a nutrient problem, not an infection. The iron is often in the soil but the tree cannot take it up, commonly because soil pH is high, soil is compacted or wet, or roots are damaged.
Where it is found
Iron chlorosis happens in any area with alkaline or poorly drained soil, which is common in many dry and limestone regions. Check your state official map; ranges change.
Official sources
What to do
- 1
Test the soil pH and ask your extension office what the result means for your tree.
- 2
Check for the real cause first: compacted soil, overwatering, poor drainage, root damage or buried root flare.
- 3
Water deeply but less often so roots can breathe.
- 4
Add a few inches of organic mulch over the root zone, kept off the trunk.
- 5
Ask a certified arborist about iron treatments such as trunk injection or soil products. Results vary, and some products work only a short time.
- 6
Do not pile on fertilizer. Too much can burn roots and does not fix high pH.
Safety first: do not climb, do not cut near power lines and do not use a chainsaw on storm-loaded wood. Call the utility for downed lines and 911 if anyone is in danger.
Prevention
Plant species that suit your soil pH. Avoid planting acid-loving trees such as pin oak in alkaline soil. Keep soil from being compacted and avoid overwatering.
When to call a pro
Call a pro if the leaves are yellow year after year, branches are dying back, or you are not sure whether it is iron, a root problem or disease. A pro can also tell you if the tree is worth treating or replacing.
Not sure who to call? Read how to hire a tree service or check is my tree dangerous?
Trees it affects
Usually seen on: Maples, Pin oak and red oaks, River birch, Bald cypress, Sweetgum, Dogwood and magnolia, Cherry and pear.
- Red Maple
- Silver Maple
- Pin Oak
- Northern Red Oak
- Shumard Oak
- River Birch
- Sweetgum
- Bald Cypress
- Flowering Dogwood
- Southern Magnolia
- American sycamore
- Paper Birch
- Bradford Pear
- Black Cherry
See all species in our tree library, or pick a tougher tree with the tree picker.
For tree companies
How to explain iron chlorosis to a customer
Explain that the yellow leaves usually mean the tree cannot use iron, not that the soil lacks iron. Be honest that treatments often need repeating and may not give a permanent fix. Offer a soil test, root zone care and, where it suits, a better-matched replacement tree.
Send this page to the customer after your visit so they can read the signs in plain words. See also selling plant health care and the job photo checklist.
Questions
What is iron chlorosis?
It is a yellowing of leaves where the veins stay green. The tree is not getting enough usable iron to make chlorophyll.
Is iron chlorosis a disease?
No. It is a nutrient problem tied to soil conditions. It cannot spread from tree to tree.
Why are my pin oak leaves yellow?
Pin oaks like acid soil. In alkaline soil they often struggle to take up iron and show yellow leaves.
Will adding iron to the soil fix it?
Often not by itself. If the soil pH is high, added iron can get locked up. Fixing the cause or using a special treatment may be needed. Ask a pro.
Can the tree die from chlorosis?
A mild case may cause only poor looks. A severe, long-term case can weaken a tree and cause dieback, making it open to other problems.
Does a soil test help?
Yes. A soil test shows pH and helps you and an arborist choose a plan. Your local extension office can usually explain how to collect a sample.
Can Lirevon diagnose iron chlorosis on my tree?
No. Lirevon is a remote marketing team for tree service companies and does not do tree work. This page is general information, not a diagnosis. A certified arborist or your county extension office can confirm what is wrong with your tree.
How do I find a good local pro for this?
Search Google Maps for certified arborists or tree services near you, read their reviews and ask for proof of insurance. Get two or three written quotes. Our guide on how to hire a tree service lists the questions to ask.
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