We Get Sick Cactus Questions


hey there…. i was wonder if you could help me with my cactus…. we had mealie mites and i used a insecticidal soap. then this started to happened and fast. could it be corking? i don’t think its root rot. i dealt with that before. is there something we can do to save it?

A tall cactus in a pot with wood chips sits by a window, perfect for those with cactus care questions. At the base is a small red plush bird wearing sunglasses and a checked scarf. Scaffolding and street traffic are visible outside. A tall cactus with brownish-yellow discoloration and spines along its ridges sits in a pot with wood chip mulch, near a window with cars outside—prompting cactus questions about proper cactus care or signs of a sick cactus.Could we cut the bad out of the cactus and callus it and replant? the tops don’t seam to be infected..

thank you for any help you can provide!!!
Gene

 

It looks to me like you have 2 plants with the same problem. After the infestation, which the soap didn’t fix, the plants would have been susceptible to infection.

I would recommend getting the 3 of them out of that soil, and repotting the 1 healthy one on its own. You can take tip cuttings of the other 2 if you can cut above the infection. When you cut, if the flesh is clean and white then you can let it callous over for a week before planting. Since it’s winter I recommend Sulfur Dust on the cut end to help prevent fungus. If the cut end is not clean then keep cutting upward til you get to clean flesh, or if the infection is all the way through the plant then it is not saveable.

Peter


    
    
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April 2026
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