I have a bunch of sunflowers growing which I planted earlier this year. They had been doing well but I recently noticed a bunch of ragged holes in many of the leaves. They are on many of the plants and at all different levels, meaning not all clustered near the ground or whatever.
I don’t see any obvious culprits. There are no beetles or caterpillars on the plants, no slime trails from slugs. I suspect it is invertebrates, though, not something like deer or rabbits (of which we have an abundance in the neighborhood this year). The plants are in a fenced-in area and some of the holes are way too high for rabbits to reach.
So what could be making largish, ragged holes in the leaves of sunflower plants, and how can I stop them? I live in Southern New England, USDA zone 5b as far as I can tell, if it makes a difference.