I hope it's ok to post this here but I couldn't find a section specifically for Chrysanthemums. So I'll be quick.

Last fall I planted a chrysanthemum in a large container and it was lovely. It's called "Helen" with burgundy flowers. I purchased it from a local nursery.

I kept it in the pot outside over winter and it came back just fine but now I'm noticing white spots on the leaves and have no idea what it could be. Closer look it seems to have tiny sap spots. I took a magnifying glass and searched but couldn't find any insects whatsoever. I've posted a couple of pics hoping someone might be able to tell me what the problem could be. It is growing just fine but it isn't looking as healthy as I'd like it. Any ideas please?

ps. (the white blotch on the bottom pic is just from the camera.)

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