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Willow · Salix

Why are there bugs on my willow tree?

Aphids are the most common pest for willows, often clustering on the tender new growth. They feed on the sap and can weaken the tree if they are not managed.

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

Check these first

  1. Look closely at the underside of new leaves.
  2. Check for sticky honeydew on the foliage.
  3. Inspect the tips of the branches for clusters of tiny insects.

Likely causes

  1. Aphid Infestation

    Most likely

    How to tell: Small green or black insects clustered on the tips of new branches. You might also see a sticky residue on the leaves.

    What to do: Spray the aphids off with a strong stream of water from your hose. For heavy infestations, use insecticidal soap every 5 to 7 days until they are gone.

  2. Nutrient Imbalance

    Possible

    How to tell: The plant is stressed and attracting pests due to over fertilization.

    What to do: Stop using high nitrogen fertilizers that encourage soft, succulent growth. This growth is exactly what aphids love to eat.

Pests on other plants

Find out what's wrong with your willow

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

A few aphids are normal, but a massive colony can stunt growth. Treat them as soon as you see them to prevent a full infestation.

Stopping it coming back

Keep your willow healthy with proper water and light. Healthy trees are much better at resisting pest attacks.

Willow: pests? Check yours with a photo

Every plant is a little different. Take a photo of your willow 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 aphids kill my willow?
They rarely kill a mature tree, but they can cause significant damage to young, developing branches.
Can I use neem oil?
Yes, neem oil is effective against aphids. Apply it in the evening to avoid burning the leaves in the sun.

Guides to these causes

More problems with Willow

Back to the Willow 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.