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Carob · Ceratonia siliqua

Why are there bugs on my carob tree?

Carob trees are tough, but they can occasionally host sap sucking insects that drain their energy. Check the undersides of your leaves and along the stems for small bumps or sticky residue.

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

Check these first

  1. Inspect the stems and leaf undersides for bumps.
  2. Look for sticky residue on the leaves or floor.
  3. Check nearby plants to see if the pests are spreading.

Likely causes

  1. Scale insects

    Most likely

    How to tell: You will see small, brown, or tan bumps that look like tiny shells attached to the stems or leaf veins. These insects stay in one place and suck sap, often leaving behind a sticky substance called honeydew.

    What to do: Scrape the scales off gently with a soft toothbrush or your fingernail. If the infestation is heavy, spray the tree with horticultural oil or neem oil every 7 to 10 days until they are gone.

  2. Mealybugs

    Possible

    How to tell: This is less common for carob trees, but mealybugs can appear if the tree is stressed by poor airflow. Look for white, cottony masses hiding in the joints where leaves meet the branches.

    What to do: Dab the white spots with a cotton swab dipped in rubbing alcohol to kill them on contact. For larger outbreaks, treat the entire plant with insecticidal soap following the label instructions.

Find out what's wrong with your carob

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

Treat the tree as soon as you spot these bugs to prevent them from weakening the wood. It is normal to see an occasional stray insect, but a full colony requires immediate action.

Stopping it coming back

Keep your carob tree in full sun and ensure it has plenty of airflow to discourage pests. Regularly wiping down leaves with a damp cloth can also help keep them clean.

Keep your carob healthy from here

Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked. Identification and a health check are free.

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Questions people ask

Can I use systemic pesticides?
It is better to stick with horticultural oils or soaps for carob trees. Systemics can be too harsh and may harm beneficial insects in your garden.
Will these bugs kill my tree?
A healthy, mature carob tree can handle a small number of pests. However, a heavy infestation will eventually stunt growth and cause leaf loss.

More problems with Carob

Back to the Carob guide

This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.