Frillylily gave you some great choices. The only other advice I have is that if you have bean beetles. Bean beetles are highly motivated by yellow. I found this out by leaving out a Nestle quick container that I used to water deck plants. The next day 15 of them drown themselves.
I went to the dollar store and bought 12 bright yellow kids sand pails. I filled them 1/2 way up with water added a little baking soda and dish soap,. That was only so I would not start mosquito farming. For stability I put a rock in the bottom and set them around the garden. Daily 20 or more would drown themselves in each pail. I would take a slotted spoon and remove them. Took a grocery sack around threw the beetles in and tied it tightly shut and put it in the trash. I must have caught over a thousand. I had so many jumping in the buckets I was worried that the new beetles would stand on the dead ones and not die. That's why I used the slotted spoon to remove them. Now I save every yellow container. I caught other bugs too and only one lady bug. Only YELLOW works. I also bought every other color of pail, pink, blue, purple, green, red and orange. I placed them next to my yellow buckets. The other colors did not catch any bugs. Then I moved the other colored buckets around the garden to have their own section. The yellow continued to have beetles and out of the other buckets I only ever caught one beetle in the red bucket. I also think they liked my yellow buckets because it was like a bigger bloom to them. Works in the flower garden too. If you have something yellow set it out there and if they drown themselves yeah!
There are a number of different beetles or their larvae that can affect corn, and which it might be can depend on your location. Can you post a picture for us of the beetle, or the damage, or preferably both? Or do you know what beetle it is?
