They don't seem to do any harm. I'm not sure, but I thought they eat other insects.

Just did some googling. They eat insects and plants. Here's some good info on getting rid of them.

http://www.wikihow.com/Get-Rid-of-Earwigs

and never saw them there. I do have a unique situation in my garden, though. I have a huge amount of lizards and frogs that generally control the insects. We always see a few earwigs in the Artichokes, probably because the reptiles can't get to them in there.

Until recently, I hadn't seen one in over a decade. Then one day, my cat was plastered against the basement window & lo & behold, there was a little toad stuck in there, hopping away, trying to get out. I rescued him & put him in our backyard. It was heartening to see one after so many years.

But they don't know what to do with them once the catch them.

I might try the tuna can trap, I just question whether it'd attract them away from the buffet they're already gorging on...

They really do a lot of damage. I often find that they bore into my peppers but at least I can salvage the peppers by cutting away the parts that are eaten. I have never grown corn, but it sounds like a perfect place for them to hide and feast. Sorry I have no help for you.

you wont get pollination. then they'll eat the tender parts of the ear.
they are why i don't grow corn.

eta- i am sure there a lot of diy traps out there. they are quite stupid.