Kalanchoe, powdery mildew

Ottawa, ON(Zone 5a)

Hello,

I'd like to ask for some advice, please - I have four Kalanchoe plants in the house, and just noticed today that three have powdery mildew, to varying degrees. Has anyone here had success with fungicide, or would the best bet be to toss the plants? Should I use fungicide as a preventative measure on the fourth plant, which is disease-free at this point?

Any tips or a point in the right direction would be much appreciated. I'm posting this question in the Cactus & Succulents forum too - not sure which is the best place for Kalanchoe talk.
Thanks very much,

Shannon :-)

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