"If it were just the okra plant that was dropping leaves, I'd be tempted to just say to ignore it and let it grow. Okra sometimes sheds its lower leaves as it grows and blooms. But since there's another plant nearby with similar symptoms, you need to investigate further.
Your plants could be infected with a wilt disease, nematodes, or be victims of compacted or poor soil.
The best bet would be to take one of the leaves to your local county extension office for an evaluation and recommendations on control.