Jack Schmidling said:

My seedling corn is being nibbled away and I am not sure who is doing
the nibbling.

Do corn borers attack seedlings or just larger plants?

Corn borers don't go after seedlings. Flea beetles do. And slugs. Both
would put holes in or tatter the tender leaves.

Flea beetles are tiny, and hop off the plants when you disturb them.

--
Pat in Plymouth MI ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)