The leaves are falling off and some are turning brown while still attached. I've included two photos below.

[![plumeria tree showing browning leaves][1]][1]
[![plumeria tree showing browning leaves][2]][2]

How do I know whether I have a pest problem or if this is just part of the changing seasons? It is currently November in South Florida.


  [1]: https://i.sstatic.net/pRMZ8.jpg
  [2]: https://i.sstatic.net/7hhjk.jpg