Malheur Experiment Station
Oregon State University
Information for Sustainable Agriculture

Herbicide Effectiveness on Weeds in Potatoes

 
Weeds
EPTC 
(Eptam)
metolachlor 
(Dual)
trifluralin 
(Treflan)
pendimethalin 
(Prowl)
metribuzin 
(Sencor, 
Lexone)
sethoxydim 
(Poast)
rimsulfuron
(Matrix) 
Preemergence
rimsulfuron
(Matrix)
Postemergence
Barley, volunteer G-F -- P -- P G G G
Barnyardgrass G G G G F G G G
Bindweed, field P -- P P P N -- P
Buckwheat F -- F -- F N P P
Clover, sweet P -- P -- G N -- --
Cocklebur P -- P -- F N F F
Crabgrass G G G G F -- F G
Dodder P P P P P N -- --
Foxtail G G G G F G G G
Knapweed, Russian P -- P -- P N -- --
Knotweed G -- G G G N -- --
Kochia F-P F G-F G-F G N G G
Lambsquarters G F G-F G-F G N F-G P-F
Mallow P F P F G N -- --
Mustard P -- P -- G N G G
Nightshade, cutleaf F-G F-G P P-F P N N N
Nightshade, hairy G F P F-P F N F-G G
Nutsedge, yellow F G-F P P P N -- F
Oat, volunteer G-F -- G -- G-F G G-F G
Oat, wild G-F F-P F F-P F-G G F G
Pigweed G-F G G G-F G N G G
Purslane G G G G G N -- F
Quackgrass G-F -- P -- F-P F N G
Sandbur G G G -- P G -- --
Smartweed P P F-P F F N -- F
Sowthistle F -- P P G N -- --
Sunflower P P P P F N G F-G
Thistle, Canada P -- P -- F N -- F
Thistle, Russian P P G-F G G N P P
Wheat, volunteer G-F -- F -- P G G G
 
G = good, F = fair, P = poor, N = none, -- = no information available
Response of weeds to any of the listed herbicides may be altered by growing conditions, weed populations, type of irrigation, genetic variations, soil type, pH, organic matter, time of application, and application rate. Ratings may vary from season to season and from site to site. Weed control generally decreases as the season progresses.

 Recommendations:


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For additional information about the Malheur Agricultural Experiment Station weed control program, please contact Dr. Corey Ransom.

Malheur Experiment Station
595 Onion Avenue
Ontario, OR 97914
(541) 889-2174
FAX (541) 889-7831