Are ants on my tree a problem?

Ants are usually just there to feed on the honeydew produced by other pests like scales. Focus on treating the scale insects to make the ants go away.

Can I use systemic pesticides?

Avoid systemic pesticides unless a professional arborist confirms a severe infestation. These can harm beneficial pollinators that visit the tree.

How do I handle pests on my Pin Oak? Causes and fixes

Check these first

Look for tiny insects or webbing on the undersides of leaves.
Check the twigs for bumps or sticky residue.
Observe if ants are climbing the trunk.

Likely causes

Oak lace bugs
Most likely
How to tell: The leaves look stippled or yellowed on top, with small black spots of excrement on the undersides. These tiny insects suck sap from the leaves.
What to do: Spray the undersides of the leaves with a strong stream of water to dislodge the bugs. If the infestation is heavy, use insecticidal soap according to the label instructions.
Scale insects
Possible
How to tell: Small, bump like growths appear on the twigs or leaves. They may secrete a sticky substance called honeydew that attracts ants.
What to do: Scrub small infestations off the twigs with a soft brush. For larger issues, apply horticultural oil during the dormant season to smother the insects.

Pests 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 you see heavy branch dieback or if the tree is losing a large percentage of its leaves. Most minor pest issues are managed by the tree's natural defenses.

Stopping it coming back

Keep the tree well watered and healthy to help it resist pest attacks. Encourage beneficial insects like ladybugs that feed on common pests.

Pin oak: pests? 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

Are ants on my tree a problem?: Ants are usually just there to feed on the honeydew produced by other pests like scales. Focus on treating the scale insects to make the ants go away.
Can I use systemic pesticides?: Avoid systemic pesticides unless a professional arborist confirms a severe infestation. These can harm beneficial pollinators that visit the tree.

Guides to these causes

Scale Insects

How do I handle pests on my Pin Oak?

Check these first

Not sure what's wrong with your pin oak?