I farm in Missouri and also try and keep some growth in my fence lines and also I have my local Coop do my spraying mainly because if something goes wrong there insurance will cover it. Also they put a different nozzle on the outside boom so as not to overspray and have drift go where its not wanted. in some instances the insurance company makes them use a non-drift additive so as not to have a problem. the only drawback to this is cost as the farmer pays that is having the spraying done but seldom have any problems.