‘Russet Burbank’ potato tolerance to dimethenamid-p applied preemergence at 0.7, 1.4, or 2.9 kg ai/ha was assessed in field studies conducted at Aberdeen, ID and Ontario, OR. Although crop injury was evident approximately 2 wk after treatment, most injury had diminished by row closure 2- to 3-wk later. Initial injury did not translate to yield loss and U.S. No. 1 and total tuber yields in dimethenamid-p–treated plots were similar to yields in the untreated, weed-free control.

Nomenclature: Dimethenamid-p; potato, Solanum tuberosum L. ‘Russet Burbank’.

Additional index words: Crop safety, crop tolerance, herbicide injury.

Abbreviations: EPTC, S-ethyl dipropyl carbamothioate; PNW, Pacific Northwest; WAT, weeks after treatment.