I don't see any bugs or insects on my Cleopatra Begonia, yet I see something is eating the leaves because I see holes in them that appear to be made by a chewing insect. No bugs are visible but the damage is clearly from a bug. I don't have a cat and my dog is not eating the houseplants. What do you suggest? Should I use Orthene? Any other less toxic alternatives? The plant is indoors. The first three photos show what appear to be holes called by a chewing insect. The last photo is a normal leaf not yet eaten. Appreciate any suggestions.