Beginner Gardening: Something is eating my corn, 0 by TammeeBee

TammeeBee wrote:
I have corn that I started from seeds 4 weeks ago, the plants range in size from 1' to 2' tall. They don't have any silk yet. The leaves are starting to look like swiss cheese, something is eating holes all over the leaves. I have found 2 small caterpillars, green in color, hiding down in the center of the plant. In some of the plants they have eaten all of the center leaves.

What are these and what can I use to get rid of them?

Thanks!