Troubleshooting
Sycamore Maple problems — and how to fix them
Sycamore Maple (Acer pseudoplatanus) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Excessive self-seeding
Produces thousands of viable seeds; considered invasive in some regions. Remove seedlings regularly from borders.
Aphids (sycamore aphid)
Large aphid populations produce sticky honeydew; rarely serious but cosmetically unpleasant.
Tar spot (Rhytisma acerinum)
Black spots on leaves in late summer; unsightly but rarely harmful — remove fallen leaves to reduce inoculum.
Verticillium wilt
Causes sudden branch dieback; prune and dispose of affected wood, sterilise tools.
Structural roots and surface roots
Root systems can be invasive near hard landscaping and foundations; site with care.
Prevent sycamore maple problems before they start
Most sycamore maple issues are care-mismatch, not bad luck. Dial in the basics:
Sycamore Maple problems — FAQ
Why is my sycamore maple excessive self-seeding?
Produces thousands of viable seeds; considered invasive in some regions. Remove seedlings regularly from borders.
Why is my sycamore maple aphids (sycamore aphid)?
Large aphid populations produce sticky honeydew; rarely serious but cosmetically unpleasant.
Why is my sycamore maple tar spot (rhytisma acerinum)?
Black spots on leaves in late summer; unsightly but rarely harmful — remove fallen leaves to reduce inoculum.
Why is my sycamore maple verticillium wilt?
Causes sudden branch dieback; prune and dispose of affected wood, sterilise tools.
Why is my sycamore maple structural roots and surface roots?
Root systems can be invasive near hard landscaping and foundations; site with care.