Tar spot found in Kansas, 2024’s first reported case in U.S.

Low levels of tar spot have been confirmed in some corn fields in Kansas.

Dr. Rodrigo Onofre, row crops specialist at Kansas State University’s Department of Plant Pathology, says, “It’s a month earlier than what we found in 2023,” he said. “We just confirmed tar spot in two counties here in Kansas, Doniphan County and Atchison County.”

He says this is the first documented report of tar spot in the U.S. for the 2024 growing season. “We’re finding that growth stage from V3 to V10.”

Onofre says now is the time to intensify scouting efforts. “And prepare for some management decisions as we go into the season.”

Kansas State University Extension says if growers wait until there is significant disease pressure in the upper canopy of the crop, a fungicide application may be too late.

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