Thank u Sue for that last post. I often rip off only as much of a leaf as has u-spores so the plant can have a bit more photosynthesis before I pull the bottom bit too. I once wondered if damaged/broken leaves succumbed more easily but saw no evidence in my observations.
I have noticed that some rusty leaves come away easily from right down at the corm. Wonder if that is an adaptive response also?? Others are stuck on like Super Glue.
Also I was long in 2 minds about ripping off leaves that have the brown resistance response markings. I look and if no u-spores are showing, I leave them until they have not much green.
Also I discovered another 2 small fans of CURLY ROSY POSY. They are spindly and have rust, so I will give them some TLC then do some experimentation. They have been stressed by growing in pretty much clay and stones and not been watered unless it rained.