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ISSUE 4  May 28, 1998


NEW HERBICIDE REVIEW CONT.

Dual II Magnum 7.65E (Novartis)
    Mode of action
: acetamide (Unknown)
   a.i.: S-metolachlor (active isomer of metolachlor)
   Crops: All crops currently labeled with Dual.
   Comments: The II in Dual II represents the addition of a safener. The Magnum represents inclusion of the active isomer of    metolachlor. Use rate is 67% of the Dual 8E rate because of the active isomer. A gradual replacement of Dual II 8E will       take place.

FirstRate 84DF (Dow)
    Mode of action: ALS inhibitor
    a.i.:
cloransulam
   Rates: 0.6 to 0.75 oz DF/A PPI or PRE, 0.3 oz DF/A POST)
   Crops: Soybean
   Comments: Weak on pigweeds and lambsquarters applied POST. Excellent control of most large-seeded broadleaf weeds  like ragweeds, smartweeds, sunflower, velvetleaf, venice mallow, and cocklebur. Poor nightshade control. Carryover trials     conducted in 1997 has shown some carryover concerns in ND.

Flexstar HL (Zeneca)
    Mode of action: PPO Inhibitor
    a.i.:
s-fomesafen (more active isomer) + adjuvants.
   Crops: Soybean.
   Comments: Rate is 0.75 pt/A. Excellent control of many broadleaf weeds. Area of use in ND is limited to area E of I-29     and S of I-94. Use area may expand in future.

Imi wheat -
Raptor/Motive (will be called a different name) for grass and broadleaf weed control in several wheat varieties. EUP in 99 and full registration in 2000.

Liberty 1.67 (AgrEvo)
    Mode of action: Glutamine synthetase inhibitor
    a.i.:
glufosinate
   Crops: Transgenic corn and soybean.
   Comments: Price reduced to $0.75 - $0.80/oz in 1998. Nonselective, nonresidual, contact type herbicide with unique     mode of action. Apply to small weeds (contact type action). Excellent control of annual broadleaf weeds. Large,                      well-tillered grasses and yellow nutsedge may not be controlled. 1998 labeling allows use of drop nozzles in conventional corn greater than 24 inches tall. Label changes also include deletion of 120 day restriction for rotation to wheat, ammonium sulfate is recommended, and application rates were increased from 10 - 20 to 15 to 20 GPA. Apply during sunlight (from dawn to 2 hours prior to sunset). Always use AMS.

Lightning 70 WDG (American Cyanamid)
    Mode of action: ALS inhibitors
    a.i.:
imazethapyr (Pursuit) + imazapyr (Arsenal) at 3:1 ratio or 52.5%+17.5%)
   Crops: IMI Corn
   Comments: Rate at 1.28 oz DF/A = approximately $18/A. 85 to 95 day maturity corn varieties available in ND.              Excellent on broad spectrum grass and broadleaf weed control. Both herbicides are ALS mode of action so ALS resistant kochia is NOT controlled. Carryover similar to Pursuit applied alone. Excellent on cocklebur, giant ragweed, lambsquarters,  nightshade, sunflower, and annual grasses. Suppression of Canada thistle. Corn chlorosis possible in cool weather and Imi corn type.

Matador 0.8EC (FMC)
    Mode of action: ACCase Inhibitor
    a.i.:
quizalofop (Same as DuPont's Assure II)

Matrix (DuPont)
    Mode of action: ALS inhibitor
    a.i.:
rimsulfuron
   Crops: Potato
   Comments: Rotation to sugarbeet is extended to 18 months. Rotation to barley stays at 9 months in Pembina, Towner,        Walsh, Grand Forks, Traill, and Cass counties. In all other counties, rotation interval has increased to 18 months.

Maverik (MON 37500) 75DF (Monsanto)
    Mode of action: ALS inhibitor
    a.i.:
sulfosulfuron
   Crops: Spring and winter wheat
   Comments: Registration expected in 1999 or 2000. PRE or POST at 0.67 oz/A for cheatgrass/downy brome, quackgrass  and broadleaf weed control in winter wheat. Has foxtail and wild oat activity. Activity on several broadleaf weeds including     wild mustard. Poor control of jointed goatgrass. Control requires moisture. Good crop safety.

Milestone (DuPont)
    a.i.:
azafenidin
   Crops: Citrus.
   Comments: Under current investigation for use in cultivated sunflower.

Motive (American Cyanamid)
    Mode of action: ALS Inhibitor
    a.i.:
Motive = imazamox
   Crops: Imi canola through possible 1998 Section 18.
   Comments: See Raptor. Future labeling may include drybean, peas, and alfalfa. Brand name for imazamox for use in Imi    wheat will be under a different name.

Muster (DuPont) - Only in Canada
    Mode of action: ALS inhibitor
    a.i.:
ethametsulfuron
   Crops: Canola and Crambe
   Comments: Possible Section 18 registration in ND, MT, and MN for use in seed canola. Controls wild mustard and a few  other broadleaved weeds. Possible U.S. registration through harmonization with Canadian data. Crop rotation = allow 1       cropping for wheat, barley, oat, and flax; allow 2 cropping seasons for canola, lentils, pea, alfalfa, dry beans, and fescue.

NorthStar (Novartis)

    Mode of action: ALS inhibitor + Plant growth regulator
    a.i.:
primisulfuron + dicamba
   Crops: Corn
   Comments: Beacon at 0.5 oz/A + dicamba at 4 fl oz/A. Registered expected in 1998. Use north of I-80 to avoid carryover  problems of Exceed.

Paramount (BAS 589) (BASF) - In USA
Accord 75DF (BASF) - In Canada
    Mode of action:
Plant growth regulator
    a.i.:
quinclorac
    Crops:
Wheat, fallow, noncropland
   Comments: Rates at 0.125 to 0.25 lb/A. Possible registration in 1999. Labeled on foxtail, barnyardgrass, cleavers,         volunteer flax, and sowthistle in Canada. ND research shows good to excellent control of kochia, leafy spurge and field bindweed. Carryover will restrict many broadleaf follow crops. Accord antagonizes Assert. Sun-It II is only adjuvant recommended. Used in Canada to control DNA and ACCase resistant green foxtail. Interest in 1998 Section 18 labeling to control volunteer flax in wheat. Crop rotation = allow 1 cropping season for wheat, barley, canola, peas, and sunflower; allow 2 cropping seasons for lentils, flax or allow 3 years years if dry conditions follow application.


Plateau 2S (American Cyanamid)
    Mode of action: ALS
inhibitor
    a.i.: imazapic
   Crops: Noncropland and road side right-of ways.
   Comments: Broadleaf and leafy spurge control in wild flowers, and some legumes. NO grazing, feeding, haying is allowed.  Do not use on switchgrass.

Poast Preferred Corn (BASF) - Name changed from Sethoxydim Resistant (SR) or Poast Tolerant corn.

Pursuit Plus (American Cyanamid)
    Mode of action: DNA + ALS
inhibitor
   a.i.: pendimethalin + imazethapyr
   Crops: Soybean
    Comments:
American Cyanamid label allows use in Roundup Ready soybean at 2.5 pt/A followed by 1 pt/A Roundup       Ultra + nonionic surfactant + AMS.

Python (Dow)
    Mode of action: ALS inhibitor
    a.i.:
flumetsulam
   Crops: Corn and soybean at 0.8 to 1.33 oz DG/A.
    Possible dry bean label in 1999.
   Comments: Same as the Broadstrike component in Accent Gold, Broadstrike + Dual, Broadstrike + Treflan, Hornet, and
Scorpion III. Allows use with preferred grass tankmix pardner. Requires rain for activation.

Quad 7 (AGSCO) - New adjuvant
   a.i.: Surfactant blends
    For use with Accent, Pursuit, and Raptor at 1% v/v. $14.75/gal.1% at 5 gpa = $0.75/A, 1% at 10 gpa = $1.50/A. May       resolve some concerns regarding use of oil additives with herbicides such as Accent + Banvel on corn.

Raptor (American Cyanamid) - In USA
Odyssey (American Cyanamid) - IN CANADA
    Mode of action: ALS Inhibitor
    a.i.:
Raptor = imazamox
   a.i.: Odyssey = imazamox (35%) + imazethapyr (35%)
   Crops: USA: Soybean. CAN = Peas and IMI canola.
   Comments: Herbicide similar to Pursuit except more active on grass and broadleaf weeds and little risk of carryover the          following year except in low pH soils. Field research has shown antagonism when mixed with other broadleaf herbicides.          May not control wild buckwheat, common lambsquarters, and ragweeds. Will not control perennial weeds.

Roundup Ready Crops (Monsanto) - EPSP synthase inhibition
    a.i.:
glyphosate
    Crops: Roundup Ready Soybean/Corn/Canola ('99)/Sugarbeet ('99)/etc
   Comments: New registrations: Preplant or preemergence and shielded applications, preharvest use in alfalfa allowing            harvest or grazing soon after application for planting to alternate crop.
   
    Earliest Roundup Ready corn and soybean varieties developed have 99 to 112 day maturities. Varieties adapted to ND       expected in 1999 or 2000. $5/bag technology fee. Conventional soybean seed = $14.00/bag. Roundup Ready soybean      seed = $22.00/bag. Possible $6.50 rebate when used with Monsanto PRE herbicides. Other considerations: Planting bin run seed vs. buying Roundup Ready soybean seed each year.
    Application window different for perennial than annuals. Spray perennial later (Bud to bloom stage) than annual weeds.
    Off patent in 2000 - many formulations may be available: Roundup/Roundup Ultra/Generics without surfactant.

Richard Zollinger
NDSU Extension Weed Specialist


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