Prickly Pear Cactus
How does one treat a diseased prickly pear cactus in Albuquerque (westside) New Mexico? Half the tunas have rotted/deteriorated over the winter.
Certified GKH Gardening Expert
It sounds like your cactus has rot. It is typically causes by too much water during dormant seasons but that normally causes rot at the base, so I think yours is caused by a fungus as the rot is higher. Treat the plant with a fungicide, and if possible, remove any rotted areas.