Host: Coastal Pricklypear (https://www.inaturalist.org/observations/120343696).
This observation is for the discoloration on the paddles of the cactus.
Cactus observation: https://www.inaturalist.org/observations/123974205
Mosaic virus? This cactus was healthy for years, but this year became infested with pests (Chelinidea vittiger? Last photo is of the bugs). Since then it's developed this discoloration on some of the pads.
Rather small plant found in the shade next to a creek.