Fresh holes or chewed leaf edges
Check for a live chewer before treating old holes.

What to check first
Look under leaves, along stems and around the pot for caterpillars, fresh pellets of droppings or signs of slugs. Ragged holes can have other causes, too.
What to do now
If you find a caterpillar you can safely identify and remove, lift it off with a tool or gloves. Leave sound leaves in place and skip sprays for old holes alone.
What to watch next
Check again the next morning or after dark if new holes appear. Fresh chewing means there may still be a visitor to identify.