Do I need to spray my whole tree?

Not necessarily. Target the specific areas where you see damage or consult a professional to determine if a full-tree treatment is necessary.

Are these pests harmful to humans?

No, these pests are specific to elm trees and do not pose a threat to people or pets.

What is eating my American elm? Causes and fixes

Check these first

Look for small holes or sawdust on the trunk.
Examine the leaves for skeletonized patches.
Check for sticky residue on the leaves or branches.

Likely causes

Elm bark beetles
Most likely
How to tell: Small holes in the bark and fine sawdust at the base of the tree. These beetles are the primary carriers of Dutch elm disease.
What to do: Remove and destroy any dead or dying wood immediately. Consult an arborist about preventative insecticide treatments if the disease is present in your area.
Elm leaf beetles
Possible
How to tell: Leaves look skeletonized with only the veins remaining. You may see small yellow eggs on the undersides of leaves.
What to do: Use a gentle spray of neem oil or insecticidal soap on the foliage. For large trees, professional systemic treatments are more effective.

Pests on other plants

Find out what's wrong with your american elm

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

Any sign of bark beetles is a major concern because of their role in spreading disease. Leaf-eating insects are usually manageable unless the infestation is severe.

Stopping it coming back

Keep the tree vigorous through proper watering and avoid wounding the bark with lawn equipment.

American elm: pests? Check yours with a photo

Every plant is a little different. Take a photo of your american elm 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 spray my whole tree?: Not necessarily. Target the specific areas where you see damage or consult a professional to determine if a full-tree treatment is necessary.
Are these pests harmful to humans?: No, these pests are specific to elm trees and do not pose a threat to people or pets.

What is eating my American elm?