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: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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