Do I need to use pesticides?

Avoid harsh chemicals if possible, as they can kill beneficial insects. Water sprays are often enough to manage lace bugs.

Will the leaves turn green again?

No, the damaged areas will remain yellow or speckled for the rest of the season. New growth should appear healthy if the pests are controlled.

Why are there pests on my London planetree? Causes and fixes

Check these first

Look closely at the undersides of the leaves for small insects.
Check for sticky residue on the leaves or the ground below.
Observe if the yellowing is uniform or speckled.

Likely causes

Sycamore Lace Bug
Most likely
How to tell: The upper surface of the leaves looks yellow or speckled, while the undersides have tiny black spots and small, flat insects.
What to do: Use a strong spray of water from a garden hose to knock the bugs off the undersides of the leaves. If the infestation is severe, apply insecticidal soap according to the label instructions.
Aphids
Possible
How to tell: Leaves may look curled or sticky due to honeydew secretions. You might see clusters of small green or black insects on new growth.
What to do: Spray the foliage with a steady stream of water to dislodge the aphids. Encourage natural predators like ladybugs to visit your garden.

Pests on other plants

Find out what's wrong with your london planetree

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

Lace bugs are mostly a nuisance that affects the tree's appearance in late summer. It is rarely fatal, but heavy infestations can weaken the tree over time.

Stopping it coming back

Keep your tree healthy with consistent watering, as stressed trees are more susceptible to pest attacks.

London planetree: pests? Check yours with a photo

Every plant is a little different. Take a photo of your london planetree 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

Do I need to use pesticides?: Avoid harsh chemicals if possible, as they can kill beneficial insects. Water sprays are often enough to manage lace bugs.
Will the leaves turn green again?: No, the damaged areas will remain yellow or speckled for the rest of the season. New growth should appear healthy if the pests are controlled.

Guides to these causes

Aphids

Why are there pests on my London planetree?