Member of the family Cactaceae. Desert succulents.

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How do I treat the survived parts of a cactus after some of it has rotten to prevent the problem spreading?

I have a cactus consisting of three "cylinders" growing from the same center point. Recently one of the cylinders started rotting rapidly and I had to remove that part. While I was doing that the ...
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brown patches on acanthocereus tetragonus (fairy castle cactus)

I've had this pair of fairy castle cacti for several years now, and they've done fairly well. However, I noticed today that they have developed brown patches over most of their stems and a few areas ...