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Pacific madrone · Arbutus menziesii

Why are there bugs on my Pacific madrone?

It is less common for Pacific madrone to have major pest issues, but aphids or scale insects can sometimes appear. Check the undersides of the leaves and along the stems for small clusters of insects or sticky residue.

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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 the leaves for small insects.
  2. Look for sticky residue on the foliage.
  3. Check the stems for hard, bump like growths.

Likely causes

  1. Aphids

    Possible

    How to tell: You will see tiny green or black insects clustered on new growth and sticky honeydew on the leaves.

    What to do: Spray the affected branches with a strong stream of water to knock them off. If they persist, apply insecticidal soap once a week until the insects are gone.

  2. Scale

    Possible

    How to tell: These look like small, hard brown bumps on the stems or leaf veins that do not move.

    What to do: Scrape the bumps off gently with your fingernail or a soft brush. For larger infestations, apply horticultural oil during the dormant season to smother the insects.

Pests on other plants

Find out what's wrong with your pacific madrone

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

You should worry if the infestation covers a large portion of the tree or if you see significant yellowing of the leaves. A few insects are usually managed by natural predators in the garden.

Stopping it coming back

Keep your tree healthy with proper spacing and avoid over fertilizing, as excessive nitrogen growth attracts aphids.

Pacific madrone: pests? Check yours with a photo

Every plant is a little different. Take a photo of your pacific madrone 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

Can I use systemic pesticides?
It is best to avoid systemic pesticides on native trees like the Pacific madrone. These can harm beneficial pollinators and birds that visit the tree.
Will these bugs kill my tree?
Usually no. While they can weaken the tree, they rarely kill a healthy, established Pacific madrone on their own.

Guides to these causes

More problems with Pacific madrone

Back to the Pacific madrone 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.