Yes, neem oil is effective, but be careful to apply it in the evening to avoid burning the stems in direct sun. Spray it lightly over the entire plant.

Will these bugs spread to my other plants?

Yes, mealybugs move easily from plant to plant. Isolate your Mistletoe cactus immediately until it is completely clear.

Why are there white fuzzy spots on my Mistletoe cactus?

Check these first

Inspect the stem joints for white cottony fluff.
Check the undersides of stems for small brown bumps.
Look for sticky residue on the leaves or the surface below the plant.

Likely causes

Mealybugs
Most likely
How to tell: You will see small white cottony masses tucked into the stem joints. They suck the sap and leave behind a sticky residue.
What to do: Dip a cotton swab in rubbing alcohol and dab it directly onto each bug to kill them instantly. Repeat this process every 3 to 5 days until you see no more signs of insects.
Scale insects
Possible
How to tell: These look like small brown or tan bumps that do not move. They attach firmly to the stem surface.
What to do: Gently scrape them off with your fingernail or a soft brush. Wipe the stems down with a mild soap and water solution once a week for a month.

When to worry

If the infestation covers more than half the plant, it is very difficult to save. A few bugs are manageable if you catch them early.

Stopping it coming back

Wipe your plant down with a damp cloth every month to remove dust and discourage pests. Keep new plants away from your collection for 2 weeks to ensure they are bug free.

Not sure which one it is? Photograph your rhipsalis.

This page lists the usual causes. Pocket Botanist looks at your actual leaf 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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Questions people ask

Can I use neem oil?: Yes, neem oil is effective, but be careful to apply it in the evening to avoid burning the stems in direct sun. Spray it lightly over the entire plant.
Will these bugs spread to my other plants?: Yes, mealybugs move easily from plant to plant. Isolate your Mistletoe cactus immediately until it is completely clear.