The Kansas Department of Agriculture is embargoing some winter wheat so crops can be tested to make sure they don't have too much pesticide residue.
The department said it made the move after it found that some farmers improperly applied a certain toxic fungicide before harvest on more than 7,500 acres in 15 counties.
Kansas Agriculture Secretary Adrian Polansky said regulators were just being cautious. Test results are expected today.
Regulators are especially concerned about south-central Kansas, where harvest has begun. Wheat at three elevators and 20 fields there are under embargo.
Embargoes were issued for affected wheat fields in Butler, Cowley, Harper, Kingman, Reno, Sedgwick, Sumner, Ellis, Gove, Jefferson, Logan, Rawlins, Sheridan, Thomas and Trego counties.