Yes, that is one problem I have not found a solution yet. We don't really have real dearth here (depends on a year), so I can't take supers off, they are still filling them right now, then once goldenrod starts they fill every cubic inch of space with honey and that ends by mid September. I would like to treat mid August, but taking supers off is too much of a hassle (I'm lazy), so I'm contemplating treating with supers on this year. Anyway I do not sell fall honey (it crystallizes way too fast to be marketable, in my opinion). Most of it goes to mead or back to the bees in spring...However the longer I left it on I delayed treating with Oxalic acid.