looks like I have some sort of beatle eating the leaves. What can I do to get rid of them and save my plant?
Certified GKH Gardening Expert
There are a few pests that can attack Canna Lily, including, Aphids, Japanese Beetle, Canna Leafroller, and numerous caterpillars.
Pick off any caterpillars or Japanese Beetles that are visible.
If you can't see a pest, it could be Aphids or slugs.
Here are some links that will help you.