Cactus Fell over with little rocking

Question

My cactus seemed to be fine, but I found gnat like bugs in my plant, all my plants really. But I was rocking my cactus back and forth to see if the roots were sturdy and the bugs didn't get to them. Then It fell over and this is what I saw. I have a feeling it could've been not enough water drainage and just rot. Can someone confirm or deny? Also, is there a proper way to salvage the cactus...Maybe Propagate?

@LittleSongbird · Answer

You can try the chop and prop (chopping on top of the rot, adding cinnamon or sulfur fungicide at the bottom, let callous, and replant) but you'll have to do immediately or soon there won't be enough to prop. This is rot.

@SvelteKingfern · Answer

I agree with @LittleSongbird . You have to chop 2.5 cm above any signs of rot (soft mushy or different more yellow or brown colour). If the healthy top is too short, it won't propagate.

@plantfinatic · Answer

Hey, I just came across this, but I was really wondering if you propagated this cactus and how it is doing if you did?

Cactus Fell over with little rocking

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