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American hophornbeam · Ostrya virginiana

What is eating my American hophornbeam leaves?

It is less common for an American hophornbeam to suffer from major pest infestations, and this usually happens due to environmental stress that weakens the tree. Check the undersides of the leaves for small insects or webbing first.

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pests on a plant
Photo: Jules Verne Times Two, CC BY-SA 4.0

Check these first

  1. Inspect the undersides of leaves for tiny insects.
  2. Look for sticky residue on the leaves or branches.
  3. Check the stems for small, raised bumps.

Likely causes

  1. Aphids

    Most likely

    How to tell: You see small, soft bodied insects clustered on the new growth or undersides of leaves. They leave behind a sticky substance called honeydew that can attract ants.

    What to do: Spray the affected branches with a strong stream of water to dislodge the insects. If the infestation is heavy, use insecticidal soap once a week for 2 to 3 weeks.

  2. Scale Insects

    Possible

    How to tell: Small, bump like growths appear on the stems or leaf veins. These insects stay in one place and suck sap from the tree, leading to yellowing leaves.

    What to do: Gently scrape off the scales with a soft brush or cloth. Apply horticultural oil during the dormant season to suffocate any remaining eggs.

Pests on other plants

Find out what's wrong with your american hophornbeam

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.

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When to worry

Worry if you see significant branch dieback or if the tree's growth slows down drastically. A few insects are usually managed by natural predators like ladybugs.

Stopping it coming back

Keep the tree healthy with proper watering and avoid over fertilizing, which can attract sap sucking pests.

American hophornbeam: pests? Check yours with a photo

Every plant is a little different. Take a photo of your american hophornbeam 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.

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Questions people ask

Do I need to use harsh pesticides?
No, avoid harsh chemicals as they kill beneficial insects that help control pests. Stick to water sprays or insecticidal soaps.
Will pests kill my tree?
Healthy, established trees can usually tolerate minor pest issues. Only severe, long term infestations pose a risk to the tree's health.

Guides to these causes

More problems with American hophornbeam

Back to the American hophornbeam guide

This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.