Tropicals & Tender Perennials: I'm baaa-ckk w/more questions....again!, 1 by Chantell

Chantell wrote:
Alrighty...back to playing musical "homes" for the plumies as we had a couple of nights last week that were below 50. As I recall, ya'll have said they should be kept at 50 and above. Yesterday I moved them back outside and noticed a few things:
1) My Duke (the one that had the previous spots) had something funky going on with it...and I'm no help b/c I can't remember (was dealing with ALL my plants yesterday) - maybe I saw "stuff" on the leaves or insects I didn't care for...mercy, sorry...can't remember. I sprayed it's leaves (and a couple other plumies & branches) lightly with Garden Safe's Fungicide 3 (Fungicide/Insecticide/Miticide). This morning...everyone looks fine except Duke...bottom leaves are yellowing. I'll attach a photo here with them. I believe the low last night was 54. Could it have been because I sprayed it early evening and it got cool? I should've thought better and done all that earlier in the day.
2) I have an unknown white that is "stuck" to the pot...ugh!!! This was a smaller cutting I got much later on and honestly didn't think to check it as the larger ones had been fine when I checked them...so annoyed with myself. My plan was to let the plumies go dormant for the winter. Should I gently pull him up out of his pot and repot with more depth to the soil? And is there a better way then others to min. injury to the roots? Or since the weather's changing should I leave him be until spring?
You all are so patient with the questions....thanks much in advance!!!