Beetles here come from much further than 1/2 mile away, usually from pasture areas from what I can guess. I can catch close to 20 lbs in just a couple hours. Link I gave was not for a trap; trap function very different than trap plants. My chickens can consume multiple pounds in a day when...
I was doing something what was essentially a trap crop where the pheromone lure was was placed down in some plants 18 to 24 inches tall. Chickens then consumed the beetles in a big way. Trap crop plants where dominated by ragweed. Beetles came off vegetation in area to land on trap crop...