I have no suggestions for catching them. My first suggestion would be not to plant a field near a public road. If it's not a public road then a camera set up on your private road should make it easy to catch them for trespassing. Planting a field near a public road is making it easy for the outlaws.
Secondly, I would erect a screen along the road like a fence or plant some sort of evergreen trees that would obscure the field once they're big enough. Once the screen is sufficient, you could resume planting the field.
Good luck catching them. If they live closer to the property than you do, it may be hard to do.
"When there was no fowl, we ate crawdad, when there was no crawdad, we ate sand."
"YOU ATE SAND!" - Raising Arizona
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