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Title: DIMETHENAMID-P: EFFICACY AND POTATO (SOLANUM TUBEROSUM) VARIETY TOLERANCE

Author
item HUTCHINSON, P - UNIV OF IDAHO
item RANSOM, C - OREGON STATE UNIV
item Boydston, Rick
item BEUTLER, B - UNIV OF IDAHO

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/1/2005
Publication Date: 12/21/2005
Citation: Hutchinson, P., Ransom, C., Boydston, R.A., Beutler, B. 2005. Dimethenamid-p: efficacy and potato (solanum tuberosum) variety tolerance. Weed Technology. 19:966-971.

Interpretive Summary: Weeds present in potatoes reduce total yield and quality of tubers. Hairy nightshade, a close relative of potato, is often difficult to control with currently available herbicides. A new herbicide, Dimethenamid-p, likely to be labeled in potato in 2005, was tested alone and in tank mixtures with currently labeled herbicides for weed control and potato response. Trials were conducted in Aberdeen, ID in 2001, 2002, and 2003 at Paterson, WA in 2001, and at Ontario, OR in 2003. Control of three commonly broadleaf weeds in potato; common lambsquarters, kochia, and redroot pigweed, was generally improved with dimethenamid-p tank mixtures compared with control by any herbicide applied alone except metribuzin. Hairy nightshade control at ID and OR was generally improved with tank mixtures compared with control by any herbicide applied alone. At WA, where row spacing was narrower than in Idaho and Oregon, dimethenamid-p alone or in tank mixtures provided similar hairy nightshade control and this control was greater than control with three currently labeled herbicides. Tolerance of five major potato varieties grown in the Pacific Northwest to dimethenamid-p was excellent under weed-free trials at Aberdeen, ID. Little or no crop injury was evident during the growing seasons and there were no reductions in U.S. No. 1 and total tuber yields regardless of dimethenamid-p rate or potato variety. Dimethenamid-p will offer potato growers improved control of problem broadleaf weeds with good crop safety.

Technical Abstract: Treatments of dimethenamid-p at 0.7 kg ai/ha applied preemergence (PRE) in tank mixtures with EPTC (3.4 kg ai/ha), metribuzin (560 g ai/ha), pendimethalin (1.1 kg ai/ha), or rimsulfuron (26 g ai/ha) were compared with the same herbicides applied PRE alone in field efficacy trials conducted at Aberdeen, ID in 2001, 2002, and 2003, at Paterson, WA in 2001, and at Ontario, OR in 2003. Common lambsquarters, kochia, and redroot pigweed control was generally improved with dimethenamid-p tank mixtures compared with control by any herbicide applied alone except metribuzin. Hairy nightshade control at ID and OR was generally improved with tank mixtures compared with control by any herbicide applied alone. At WA, where row spacing was narrower than at other locations, dimethenamid-p alone or in tank mixtures provided similar hairy nightshade control and this control was greater than control by EPTC, metribuzin, or pendimethalin applied alone. 'Alturas', 'Bannock Russet', 'Ranger Russet', 'Russet Burbank', 'Russet Norkotah', and 'Shepody' potato tolerance to dimethenamid-p PRE at 0, 0.7, or 1.4 kg ai/ha was assessed in weed-free field trials conducted at Aberdeen, ID in 2002 and 2003. Little or no crop injury was evident during the growing seasons and there were no reductions in U.S. No. 1 and total tuber yields regardless of dimethenamid-p rate or potato variety.