Are these spots contagious to other plants?

If the spots are caused by mealybugs, they can spread to nearby plants. Isolate the cactus until the infestation is cleared.

Will the spots go away?

Most spots are permanent scars on the skin of the cactus. They will not disappear, but you can prevent new ones from forming.

Why are there spots on my Cereus repandus? Causes and fixes

Check these first

Look closely for white cottony insects.
Check if the spots are sunken or soft.
Verify if the plant has been exposed to high humidity.

Likely causes

Mealybugs
Possible
How to tell: Small white cottony clusters appear in the crevices of the cactus.
What to do: Dab the spots with a cotton swab dipped in rubbing alcohol. Repeat this weekly until the insects are gone.
Fungal Infection
Possible
How to tell: Dark, sunken spots appear on the skin of the cactus.
What to do: Ensure the plant has excellent airflow and keep the stems dry. Avoid overhead watering to prevent fungal growth.

Leaf spots on other plants

Find out what's wrong with your peruvian apple 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.

When to worry

Worry if the spots are spreading or turning into large, mushy lesions. Small, dry, corky spots are often just natural aging.

Stopping it coming back

Keep the plant in a bright, airy location and avoid getting water on the stems during irrigation.

Peruvian apple cactus: spots? Check yours with a photo

Every plant is a little different. Take a photo of your peruvian apple 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.

Get the app · Or check it from a photo now, free

Questions people ask

Are these spots contagious to other plants?: If the spots are caused by mealybugs, they can spread to nearby plants. Isolate the cactus until the infestation is cleared.
Will the spots go away?: Most spots are permanent scars on the skin of the cactus. They will not disappear, but you can prevent new ones from forming.

Guides to these causes

Mealybugs

Why are there spots on my Cereus repandus?

Check these first

Not sure what's wrong with your peruvian apple cactus?