you can snare them.Take a stick about 3-4'' X 5-6 foot long hammer in some nails about 8-10" apart,almost all the way leave enough of the head sticking up to tie or wrap some heavy fishing line or strong pliable wire.make some small loops,( snares) lean the stick against a tree where the squirrels would run up and down it and bait it with peanut butter. Or in your case kernels of corn.
Elkshed