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Christmas cactus · Schlumbergera

What are these white fuzzy spots on my Christmas cactus?

Those white, cottony spots are likely mealybugs hiding in the crevices of your plant. They suck the sap and can weaken your cactus if left alone.

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

Check these first

  1. Examine the joints between the leaf segments carefully.
  2. Look for sticky residue on the leaves or the surface below the plant.
  3. Check nearby plants to see if the infestation has spread.

Likely causes

  1. Mealybugs

    Most likely

    How to tell: You see small, white, fuzzy masses in the joints between stem segments. The plant may look stunted or lose segments.

    What to do: Dip a cotton swab in rubbing alcohol and dab it directly onto the white spots to kill them. Repeat this every few days until you see no more bugs.

  2. Scale Insects

    Possible

    How to tell: Small, hard, brown bumps appear on the stems that can be scraped off with a fingernail. They act like tiny shields for the insects underneath.

    What to do: Gently scrape the bumps off with a soft toothbrush or cotton swab dipped in alcohol. Monitor the plant closely for a few weeks to catch any new ones.

Pests on other plants

Find out what's wrong with your christmas cactus

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

If the entire plant is covered in white fuzz, it is a severe infestation that is hard to clear. Isolate the plant immediately to protect your other greenery.

Stopping it coming back

Wipe the leaves down occasionally with a damp cloth to keep them clean and inspect them during your regular watering routine.

Christmas cactus: pests? Check yours with a photo

Every plant is a little different. Take a photo of your christmas cactus 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 plant?
They can weaken it significantly over time, but they are treatable if you are consistent.
Should I use pesticides?
Usually, rubbing alcohol is enough for a Christmas cactus. Avoid heavy chemicals unless the infestation is overwhelming.

Guides to these causes

More problems with Christmas cactus

Back to the Christmas cactus 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.