I know it is a little early to talk about fly control. We've got about 2 ft. of snow outside. I've got one pasture with real bad fly pressure. I just started to rent it last year. I had a real bad pink eye blow out. I pour my cow's and calves in July plus put some CTC in the mineral to combat the pinkeye. It has always worked well here at my home place. Turns out the neighbor next to the pasture I rent never does anything. I've saw an ad somewhere that sells an insecticide that is applied in a creep feeder. I guess you hang it inside the feeder. The calves walk under it when they come in to eat. Anyone ever heard of such a thing?? Let me know a web site. Thanks!!