Hi, A White Powder Has Appeared On My Cactus And Appears To Be Spreading! Thoughts On A Cause And Cure!?! TY!

Question

Whatever is the issue it appears to be spreading quickly. Is it a fungus or a watering issue?? TY!

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Answer 1

It is either fungal or bacterial. It could definitely be related to watering, as well. Since those stones cover the top, it can be difficult to tell when it needs water. I would advise using a moisture meter, and waiting until the soil is completely dry down to about halfway into that container before watering again. Be sure that all extra water is removed from the outer container after doing so.

I would treat with a fungicide, as well.

Here are some articles that will help:

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-going-soft.htm

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm