Tar spot has taken hold across the Great Lakes this season with its strongest presence in Michigan and Indiana.

Kristin Poley with the Corn Marketing Program of Michigan tells Brownfield hot, wet conditions in July and August has the disease spreading like crazy.

“Tar spot is everywhere this year,” she says.  “We haven’t quite seen it at this distribution this early in the season ever.”

She says if growers aren’t treating, they could see at least 50-bushel yield losses.

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