My mexican fence post cactus has developed some sort of white/yellowish fungus(?) on it. Anyone know what it is? I hope it's not a goner!!!
Looking for some help to save this guy!
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How sure are you, that this is a fungus?
To me, it looks suspiciously like scale, although the photos are a bit blurry.
Try to pry off one of the bigger thingies. If my suspicion is correct, you'll find a shell-like object (actually an insect) that pops off in one piece.
We have more Q/As on scale, in short, typical treatments are spraying with neem or an insecticide, using a systemic insecticide or washing the insects off with a soft cloth or toothbrush. Better yet, a combination thereof, used repeatedly over a few weeks.