Euphorbia Fungus

Hello friends at Cactus Jungle,

My beloved euphorbia pseudocactus has been having some problems lately. I’ve noticed two distinct issues, which I was hoping you could help me diagnose.

1. Black and brown discoloration, over wide areas of all 3 pseudos. (see picture)
-I know this can happen with overwatering, but I’ve owned this plant for 3 years and have watered at most once every 4 to 6 weeks.

2. Chunky holes (see picture)
-possible pest infestation?

I am currently having a mealy bug problem with other succulents in my garden, but I haven’t see any signs of mealies on the pseudocactus. Any ideas as to what might be causing the above issues and how I can treat them?

Thanks a million!

-Kristi

Kristi,
The holes look like they have healed over, whatever had caused them in the first place, so I wouldn’t worry about them at this time. However, the black spots, with rainbow coloration around it, looks like a fungal infection. This needs to be fixed ASAP or you will lose that portion of the plant over the winter.

It doesn’t sound like it was overwatering. Has light or airflow conditions changed recently?

Treat with Neem oil, or we also have a product called Mildew Cure.
Take care,
Peter

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