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European crabapple · Malus sylvestris

Why are there bugs on my European crabapple?

Finding pests on your crabapple is common, especially during the spring when new growth is tender. Check the undersides of leaves and the tips of new branches first to see what you are dealing with.

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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 tiny insects.
  2. Look for sticky residue on the stems.
  3. Check for fine webbing near the leaf joints.

Likely causes

  1. Aphids

    Most likely

    How to tell: You will see tiny green or black insects clustered on new growth, often causing leaves to curl or look sticky. They leave behind a shiny substance called honeydew.

    What to do: Spray the affected branches with a strong stream of water to knock them off. If they persist, apply insecticidal soap or neem oil directly to the insects every 5 to 7 days until they are gone.

  2. Spider Mites

    Possible

    How to tell: These tiny pests create fine webbing between leaves and cause the foliage to look speckled or yellow. They thrive in hot and dry conditions.

    What to do: Increase humidity around the tree if possible and rinse the foliage thoroughly with water. Use a horticultural oil spray to coat the leaves and disrupt their life cycle.

Pests on other plants

Find out what's wrong with your european crabapple

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 is covering the entire tree and causing significant leaf drop. A few bugs are normal and usually handled by beneficial insects like ladybugs.

Stopping it coming back

Keep your tree healthy with proper watering and avoid excessive nitrogen fertilizer, which encourages the soft growth that aphids love.

European crabapple: pests? Check yours with a photo

Every plant is a little different. Take a photo of your european crabapple 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

Will these bugs kill my tree?
Usually no, but a heavy infestation can weaken the tree and make it susceptible to other issues. Keep an eye on the new growth to catch them early.
Can I use household soap to kill them?
Avoid using harsh dish soaps as they can burn the leaves. Stick to insecticidal soaps specifically formulated for garden use.

Guides to these causes

More problems with European crabapple

Back to the European crabapple 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.