I've posted about this in years' past and it continues to be a problem, for the same (and only) plant. It's my subquintuplinervis, which I got from Ted Green as a cutting in 2008. It's always had this flaky brown stuff that forms on the leaves. It's been suggested it might be a fungus of some sort, but it's dry, on the surface only, it doesn't get any worse in summer when it's hot and humid. I wash it off using soap and a soft toothbrush - it forms on the leaves as well as the stems. It does not seem to affect the growth or leave any markings at all. When I get it all washed off, the plant looks quite nice, but then a few months later, it's got the brown flaky stuff building up again. It tends to be a bit heavier on the undersides of the leaves. I've kept it in full sun, which is supposed to naturally kill fungus. I've tried cleaning it up then drenching it with almost full-strength rubbing alcohol. Nothing I've done so far seems to stop it. What do you think of some Desinex spray, which is an anti-fungal? Someone suggested that to me years ago when I had fungus on a succulent, so I have some around here SOMEwhere...
Anyway, I just made some cuttings, hoping to clean them up and have starts that don't get the flaky stuff. I'm thinking of soaking them in water with some vinegar or hydrogen peroxide before planting them, but I was wondering what you guys think. And if either of these seem like a good idea, how concentrated would you make the soak?
Denise in Omaha