I had rust on my plumeria last year, but never on the Pudica. I sprayed the leaves today -- I'll keep checking, Hope I don't have to repeat the spraying -- it does drift and they're right in my flower beds. I don't want to cause problems for the butterflies and bees, and I have a lot of bees flying around. They have set up a home in an upside down clay pot which has a bird bath on top; there must be enough of a gap for them to get into the big pot (which has a large drainage hole).