Help, I am having a serious problem with my large Kalanchoe’s. I’ve had these for several years and they have thrived to the point I’ve given away 100’s of cuttings. I put them outside on my deck in the summer as I live in New Hampshire so they can’t stay outside all year. I’ve never had any issue with them except they don’t flower often. However this winter I started noticing on the 4 Large ones I have that the leaves have white dust on them. Two of the four have dropped 98% of its leaves but new shoots and leaves are starting. Can anyone tell me what the issue is and how to solve it??? I’m attaching a picture of one from last October and the same plant today. I so would appreciate any help anyone can give me.

