Can you tell me what is eating my Canna Lily leaves
Something is eating my Canna leaves
Certified GKH Gardening Expert
That, certainly, is an unusual pattern.
That is some sort of insect, but it would be hard to guess which without seeing other signs of it. Caterpillars, ants, and many other insects can cause this type of damage.
A broad spectrum insecticide will usually take care of the issue. This article will help: https://www.gardeningknowhow.com/special/organic/natural-home-pesticides-organic-garden-pest-control.htm
On another note. I would also treat for a minor fungal infection, as noted in the tips of some of those leaves. This article will give you more information: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm