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2008 North Dakota Weed Control Guide

W-253, January 2008
R. K. Zollinger, NDSU Extension Weed Specialist

RELATIVE HERBICIDE EFFECTIVENESS ON WEEDS -

SOIL-APPLIED HERBICIDES

The following ratings give relative herbicide effectiveness. Under favorable conditions control may be better than indicated and under unfavorable conditions herbicides may give erratic results. Dry and cool weather increases herbicide persistence while wet and/or warm weather reduces herbicide persistence.

Weed control ratings in this section are based on the following scale:
E = Excellent = 90 to 99% control
G = Good = 80 to 90% control
F = Fair = 65 to 80% control
P = Poor = 40 to 65% control
N = None = No control

Herbicide persistence ratings are for residues present 12 months after application:
O = Often S = Seldom N = None

SOIL - APPLIED HERBICIDES Mode of
action		 Barnyard-
grass		 Field
sandbur		 Green
foxtail		 Yellow
foxtail		 Quack-
grass		 Vol.
cereals		 Wild
oat		 Proso
millet		 Wild
buckwheat		 Common
cocklebur
Kochia		 C. Lambs
quarters
                  
Acetochlor (PPI) 15 E G-E G-E G-E N G F F-G P P F G-E
Acetochlor (PRE) 15 E G G-E G-E N G P F-G P P P-F G
Atrazine (0.38 lb ai/A) 5 P P P P N F-G F-G N G-E F G-E G-E
Atrazine (0.5 - 0.75 lb ai/A) 5 F P P P-F P G-E G-E P E G E E
Authority Assist (PRE) 2,14 P N P P N N N N F-G P E E
Authority First/Sonic (PRE) 2,14 N N P P N N N N P-F E E E
Authority MTZ (PRE) 5,14 P-F P-F P-F P-F N P P P F-G P-F E E
Balance Pro (PRE) 27 E G E F-G P N N E N P E E
EPTC (PPI) 8 E G-E E E F-G G-E G-E F-G F P P F
Far-Go (PPI) 8 N N N-P N-P N N E N N N N N
Gangster (PRE) 2,14 N N P P N N N N P-F E G E
Lorox 7 F - G G P - - - E E - E
Matrix (PRE) 2 G - G F-G N G F P P F G1 F
Metolachlor/s-Metolclr.* (PPI) 15 F-E F-P F-E F-E N P-G P-F N-P N-P N N-P P-F
Metolachlor/s-Metolclr.* (PRE) 15 P-G F-P F-G F-G N P-F P N N-P N N-P P-F
Metribuzin (PPI) 5 F F F F P G N P F F G F
Metribuzin (PRE) 5 P-F P-F P-F P-F N P P P F P-F F-G P-F
Nortron/generics (PPI) - P F F-G F-G P E G - F-G P F-G P-F
Nortron/generics (PRE) - P P-F F F P G-E F-G - F P F P-F
Outlook/generics (PPI) 15 G-E G G-E G-E N G P F P N P F
Outlook/generics(PRE) 15 F-G G G-E G-E N F P F P N P F
Paramount 4 G-E N E G N N N N N N F F
Prowl/generics (PPI) 3 E G E1 E N G F P-F P N P E
Prowl/generics (PRE) 3 E F G-E1 G-E N F-G P P N N P G
Pursuit (PPI) (0.72 oz DG) 2 P N P P N N N N G N E1 P-F
Pursuit (PRE) (0.72 oz DG) 2 P N P N N N N N F-G N E1 P
Pursuit Plus (PPI) 2,3 E G E1 E N G F P-F E N E1 E
Python (PPI/PRE) 2 N N N N N N N N F-G P E1 E
Resolve (PRE) 2 P - F-G F-G N F P - N P F1 F
Ro-Neet (PPI) 8 E G E E P G-E G - P-F P P F-G
Sonalan (PPI) 3 E G E1 E N P P P-F P P P-F E
Spartan (PRE) 14 N N P P N N N N F-G P E E
SureStart (PRE) 2, 4,15 E G E E N G P F E E F-G E
Trifluralin (PPI) 3 E G E1 E N N P-F P-F P N P G-E
Valor/Chateau (PRE) 14 N N P P N N N N P-F N G-E E
PPI = Preplant Incorporated, PRE = Preemergence, POPI = Post plant incorporated.

1Except where resistant populations have developed.
*Ratings are based on equivalent product rates as S-Metolachlor.
**Numbers represent herbicide mechanism of action from a numerical classification system found on page 108-109.

 

SOIL- APPLIED
HERBICIDES		 Lanceleaf
sage		 Common
mallow		 Venice
mallow		 Marsh
elder		 Mustard,
Wild		 Mustards
Wnt. Ann.		 E black
nightshade		 Hairy
nightshade		 Redroot
pigweed		 Prickly
lettuce		 C. rag-
weed		 Smart-
weed		 Sun-
flower		 Russian
thistle		 Biennial
wormwood		 Canada
thistle		 Herbicide
persistence
                        
Acetochlor (PPI) N - - P F - G-E G-E E - F-G P P F N N N
Acetochlor (PRE) N - - P F - G G G-E - F P N F N N N
Atrazine (0.38 lb ai/A) G - F F G G G G G G F F F G G N N
Atrazine (0.5 - 0.75 lb ai) E - G E E E E E E E E E G E E N S
Authority Assist (PRE) - F G P-G E E E E E P P E P G-E G-E N O
Auth. First/Sonic (PRE) E - E E E E E E E - E E E G-E G N O
Authority MTZ (PRE) F-G F-G G E G-E G-E E F-G E E G-E E P-F G-E G-E N S
Balance Pro (PRE) - - G-E G E G-E G-E G-E E G-E G-E G P G G-E N S
EPTC (PPI) N F-G N P P P F F G P F P N P N N N
Far-Go (PPI) N - N N N N N N N N N N N N N N N
Gangster (PPI/PRE) E - E E E E E E E - E E E G-E G N O
Lorox (PRE) E - - - G G - - E - E E - - - N N
Matrix (PRE) N - - N F - P P E - F P F P N N S
Metolachlr/s-Meto.*(PPI) N - N N N - N N G N P N N P N N N
Metolachl/s-Meto.*(PRE) N - N N N - N N F N P N N P N N N
Metribuzin (PPI) F-G F-G F E E E P P E E E G P-F E G-E N S
Metribuzin (PRE) F-G F-G P E G-E G-E P P G-E E G-E G P G-E G-E N S
Nortron/generics (PPI) - P F P F - F-G F-G G-E - P G-E P F-G - N O
Nortron/generics (PRE) - P F P P-F - F F G - P G P F - N O
Outlook/generics (PPI) N - - N P-F - F-G G E - P P N P-F N N N
Outlook/generics (PRE) N - - N P-F - F-G F-G G-E - N P N P N N N
Paramount N - N N N N N N F E F N F F - P S
Prowl/generics (PPI) N - F-G N N P N N E N P P N G N N S
Prowl/generics (PRE) N - F N N P N N G N P P N F-G N N S
Pursuit (PPI) (0.72 oz DG) - F N P E E E E E - N F P P N N O
Pursuit (PRE) (0.72 oz DG) - F N P E E E E E - N F P P N N O
Pursuit Plus (PPI) E - F-G G-E E E E E E E F G P G-E P N O
Python (PPI/PRE) G-E - E P-F E E G-E G-E E - P G-E P E G-E N S
Resolve (PRE) - - - - - - P P F-E - F - - P - N S
Ro-Neet (PPI) N F-G F P P P F-G F-G G P P P N P - N N
Sonalan (PPI) N - F-G N N P P P E P P P N G-E N N S
Spartan (PRE) N - G P-G P P E F-G E P P E N G-E G-E N S
SureStart (PRE) G - G-E E E E E E E G-E E E E F-G E F O
Trifluralin (PPI) N - F-G N N P N N E N P P N G N N S
Valor/Chateau (PRE) N - E P G N E E E G F F P F G N N
PPI = Preplant Incorporated, PRE = Preemergence, PoPI = Post plant incorporated.

1Except where resistant populations have developed.
*Ratings are based on equivalent product rates as s-metolachlor.

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W-253, January 2008