Chronic Fungal Spots on a 30-Year-Old Prickly Pear (Opuntia)

A 30+ year Opuntia in NW Texas has had large black spots for 5 years, worsened by unusual early rains. The base looks black—rot likely in roots and tissue. Spots suggest systemic fungus. Cochineal scale and mealybugs are other possibilities, but presentation fits deep-seated rot. The plant is dying. Take multiple healthy pads NOW (active growth), callous, and replant elsewhere. Discard old plant and soil—don't compost. Let soil lie fallow 1–2 seasons. New pads may carry disease, but most rot appears basal. A chance for renewal.