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Japanese pagoda tree · Styphnolobium japonicum

Why are there pests on my Japanese pagoda tree?

Seeing bugs on your Japanese pagoda tree can be alarming, but it is usually manageable. Scale insects are the most common culprits, appearing as small bumps on the bark or leaves. Check the undersides of leaves and along the stems 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 small bumps.
  2. Look for sticky residue on the foliage.
  3. Check near the base of branches for clusters of insects.

Likely causes

  1. Scale insects

    Most likely

    How to tell: You will see small, raised, brown or tan bumps on the twigs and leaf undersides. These bumps do not move and often feel waxy to the touch.

    What to do: Scrape off light infestations with a soft brush or your fingernail. For larger issues, apply horticultural oil or neem oil spray to the affected areas every 7 to 10 days until the pests are gone.

  2. Aphids

    Possible

    How to tell: Look for clusters of tiny green or black insects on new growth. They often leave behind a sticky substance called honeydew that attracts ants.

    What to do: Blast the insects off with a strong stream of water from your garden hose. If they persist, use insecticidal soap once a week until the population drops.

Pests on other plants

Find out what's wrong with your japanese pagoda tree

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 yellowing or branch dieback alongside the pests. A few bugs are normal, but a heavy infestation can weaken the tree over time.

Stopping it coming back

Keep your tree healthy with proper watering and annual pruning to improve airflow. Healthy trees are much better at resisting pest attacks.

Japanese pagoda tree: pests? Check yours with a photo

Every plant is a little different. Take a photo of your japanese pagoda tree 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 they can stress it out. If left untreated for a long time, heavy scale infestations can cause branch dieback.
Can I use chemical pesticides?
It is best to avoid harsh chemicals. Horticultural oils and insecticidal soaps are safer for the tree and the surrounding environment.

Guides to these causes

More problems with Japanese pagoda tree

Back to the Japanese pagoda tree 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.