My cactus has black spots, but they are HARD, not mushy like rot.
One of them also has this powdery white coating that also appears in other places, but not so thick.
The white area to the left is actually black underneath.
The cactus flesh is indented where the spots are.
The cactus is also "bending" slightly toward the spots at the affected area.
We re-potted the plant about a month ago with new purchased soil mixed for cacti.
Also, this is a single stalk cactus; there are no stems that can be harvested/rooted/etc. in order to save the plant.
Can someone help me with this problem.