We have 15 calves on 5 acres. Pretty much a dry lot with this drought. We have lots of flies not so much biting flies bothering the calves but tons of house flies bothering my neighbors. I am trying to figure out a good way to reduce the numbers and was thinking of spraying the entire 5 acres. I have a small sprayer with a boom for my tractor and could spray the whole property fairly easily. I did a search and could not find any chemicals specifically for ground application fly control. Wondering if this is a good idea and what to spray.