Hi, Sorry about the trouble , the one plant does have crown rot the other looks like brown scale If you have a Lowes in your area the Bayer in the blue bottle works well it says on the label kills bugs for 30 days I don't believe it I would use it weekly for 3 weeks then watch it for awhile longer . There are other sprays if any have oil in them like Neem oil keep the plant out of the sun after using it also keep the plant away from any other plants you have .
The damage on the leaf looks like a mechanical injury and is nothing to worry about . Man I hate to be the bad news person ... sorry . Gin
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