I've had good luck using the IGR mineral blocks from MoorMan's (methoprene).
What it does is makes the cow's manure worthless for horn fly larvae, so it really cuts down on the overall fly population. For this reason, the effects aren't immediate, so if you already have a bad fly problem, you won't see results for a long time (maybe 30 days?) after you start the cattle on it.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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