Researchers in Washington and Oregon tested herbicide combinations to control yellow nutsedge—a stubborn weed—in potato and onion fields, finding that certain multi-herbicide programs suppressed the weed over 90% all season with minimal crop damage and no yield loss.
1
Multi-herbicide programs combining EPTC, S-metolachlor, metribuzin, and rimsulfuron achieved 93–96% season-long control of yellow nutsedge across both trial sites.
2
Crop injury was negligible (0–0.5% in Washington, none in Oregon), and no yield loss was detected at either location.
3
Marketable potato yield was notably higher in Oregon (58.5 t/ha) than Washington (47.5 t/ha) despite comparable weed control, suggesting soil and climate outweigh herbicide effects on productivity.
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