Several years ago I was on a property around Bay City Mi. The place was being managed to the fullest, food plots, bedding, etc. The property owner had covered the plots with cedar poles, confident they helped to keep the deer on his property until well after dark as they were so busy feeding and rubbing those cedar poles. He was certain his neighbors would never shoot one of "his" bucks.
After finishing in MI, we went on to Iowa and met up with Jay Greggory. I told him about the cedar poles all over MI and the landowner's reasoning. Sheepishly, Jay said he does something very similar.... ewww... OK. Maybe there is something to it. Jay's property was right across the road from Drury's Iowa ground, but I didn't see any plastic trees at the time.