Quote:
Originally Posted by SueCT
My guess would be black spot. It causes the leaves to drop. Once conditions improve, the new leaves will grow.
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Sue, there were two leaves on the rosebush with black spots on them. The first result on a search shows what they look like
https://www.thespruce.com/black-spot-on-roses-4125530 There was too much rain and constant humidity. Me and Worth were both right, but you nailed it.