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Japanese holly · Ilex crenata

What is eating my Japanese holly leaves?

If you see squiggly lines or tunnels on your leaves, you likely have holly leaf miners. These tiny larvae live inside the leaf tissue and are common in many holly varieties.

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

Check these first

  1. Look closely for winding trails on the leaves.
  2. Check the undersides of leaves for tiny webs.
  3. Shake a branch over a white paper to see if mites fall off.

Likely causes

  1. Holly Leaf Miner

    Most likely

    How to tell: You will see winding, pale trails or blotches on the leaf surface. These are the tunnels where the larvae are feeding.

    What to do: Prune away and destroy heavily infested leaves to reduce the population. Apply a systemic insecticide containing imidacloprid in early spring before the adults emerge.

  2. Spider Mites

    Possible

    How to tell: Leaves look stippled or dusty, and you might see fine webbing between branches. These pests thrive in hot, dry weather.

    What to do: Spray the foliage with a strong stream of water to knock them off. If the infestation is heavy, use neem oil or insecticidal soap every 7 days.

Pests on other plants

Find out what's wrong with your japanese holly

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

Minor leaf miner damage is mostly cosmetic and rarely kills the plant. Worry if the entire shrub is covered in tunnels or if the plant shows signs of severe stress.

Stopping it coming back

Keep your holly healthy with proper watering and regular monitoring during the spring growing season.

Japanese holly: pests? Check yours with a photo

Every plant is a little different. Take a photo of your japanese holly 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 spray the whole plant?
Yes, systemic treatments work best when applied thoroughly to the entire canopy. Follow the label instructions for exact timing.
Will the tunnels go away?
The tunnels are permanent damage. The plant will eventually grow new, clean leaves to replace them.

Guides to these causes

More problems with Japanese holly

Back to the Japanese holly 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.