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ISSUE 2   May 13, 1999

1999 HERBICIDE AND SECTION 18 UPDATE

Sonalan (Dow)
Mode of action: Dinitroaniline - Root/shoot inhibitor -microtubule assembly inhibitor
a.i.: ethalfluralin
Crops: Sonalan is registered on chick pea/garbanzo bean.

    Comments: 1999 Section 18 registration for control of ALS susceptible and resistant kochia in canola
has been granted in Minnesota, Montana, and North Dakota. Sonalan HFP and Sonalan 10G may be
applied and incorporated before planting. Follow soil preparation, application, and incorporation procedures
recommended in the "General Information" section of the respective product labels. A maximum of one
application of either product may be applied per crop year, using ground equipment only.

Sonalan Broadcast Rates per Acre:

Soil Texture

Sonalan HFP

Sonalan 10G

(pints/A)

(lb/A)

Coarse

1.5 to 2

5.5 to 7.5

Medium

2 to 2.5

7.5 to 9.5

Fine

2.5 to 3

9.5 to 11.5

    Use higher rate in rate range where difficult to control weeds or higher weed populations are anticipated.
The official label must be in the possession of the user at the time of application.

Spartan (FMC) - 75DF
Mode of action: PPO inhibitor
a.i.: sulfentrazone
Crops: Sunflower

    Comments: 1999 Section 18 Crisis Exemption registration on sunflower granted in Minnesota,
North Dakota, and South Dakota on conservation tillage sunflower fields where kochia is present at
densities that will cause economic loss if not controlled. Use period is April 30 to June 30, 1999.
Conservation tillage includes no_till and reduced_till practices in which herbicides are used to control
weeds instead of tillage. The purpose of the practice is to increase crop residue, increase soil water
storage, reduce run_off, and reduce wind and water erosion.

Apply in at least 10 gallons of water per acre at rates of 2.67 to 5.33 lb 75DF/A.

Broadcast Rates of Spartan 75DF per Acre:

Organic matter

Coarse

Medium

Fine

(oz/A)

(oz/A)

(oz/A)

0 to 2%

2.67

4

4.25

Over 2%

2.67

4.25

5.33

Apply one application from 14 days prior to planting to 3 days after planting sunflower. Spartan may be
tank-mixed with Prowl.

    FMC intends for Spartan to be used by growers who agree that FMC will not be help responsible
for failure of performance or crop damage from use of the product in a single preplant incorporation
or preemergence application.

    In addition to kochia, Spartan may also control other small-seeded broadleaf weeds, such as,
annual smartweeds, Russian thistle, wild buckwheat, nightshade species, biennial wormwood,
marshelder, pigweed species, and common lambsquarters. Spartan may also suppress foxtail.
Spartan has NO perennial weed control. No weeds have become resistant to the mode of action
of Spartan (PPO inhibitor) and other herbicides of the same mode of action.

    Spartan REQUIRES MOISTURE FOR ACTIVATION. Consistent control of sensitive
broadleaf weeds, grass suppression, and marginally controlled weeds greatly depends on rainfall
shortly after application and before weeds emerge. At least one inch of rain is required after
application for optimum weed control. If no rain occurs after application, a light harrowing or rotary
hoe operation may destroy emerging weed seedlings and help active the herbicide. Spartan will not
control weeds once emerged.

    Follow the following crop rotation guidelines when rotating crops the year following Spartan
application.

Rotational Crop Guidelines

Crop

Recropping interval (Months)

Soybeans

Anytime

Wheat, barley, rye, oats, triticale

4

Field corn

10

Sorghum

10

Buckwheat and millet grasses

12

Canola

24

Sugarbeet

24

    Crops with rotational restrictions greater than 12 months after Spartan application are the result
of crop injury. For rotation to other crops not listed above, refer to the Crop Rotation Restriction
Section of the 1999 North Dakota Weed Control Guide, page 116-117 or federal label.

Authority (DuPont) - 75DF
Mode of action: PPO Inhibitor
a.i.:
sulfentrazone
Crops: PPI or PRE in soybean

    Comments: Authority contains the same active ingredient as Spartan. DuPont has rights to
market Authority only in soybeans. Registered in ND for 1999 but ND information bulletin that
accompanies the label gives specific use information.. Weed spectrum has been expanded to
include biennial wormwood, marshelder, black nightshade, Russian thistle, and witchgrass. Do not
use any product that contains chlorimuron (Classic, Synchrony, Reliance) product following Authority
due to very, very, very long carryover. Authority has 6 to 8 weeks residual weed control, has same
mode of action as Blazer and Cobra, controls a wide spectrum of small-seeded broadleaf weeds
including all pigweeds species, and nightshades, and has excellent burndown activity for use in no-till.
Research initiated to explore fall applications which will utilize winter moisture for activation.

    Authority may not mix well in cold water (40 to 50F). Allow additional mixing time, up to 10 minutes,
to allow granules to completely dissolve or can pre-slurry with warmer water to speed up mixing time.
Once granules are suspended, normal settling of small flakes may occur when agitation is stopped.
Flakes are easily suspended with agitation, even after allowing to sit overnight. Mixing problems only
occur when granules are not suspended and settle in the tank.

Balance (Rhone Poulenc)
Mode of Action: Carotenoid inhibitor.
a.i.: isoxaflutole
Crops: Corn

    Comments: Registered in September of 1998. Apply PRE for wide spectrum grass and broadleaf
weed control, including wild proso millet, woolly cupgrass, sandbur, and kochia. Do not apply to corn
POST or severe corn injury will result. Weak on yellow foxtail, sunflower, giant ragweed and wild
buckwheat. Requires rain for maximum weed control. Will control small emerged weeds after a rain
event due to movement to and absorption through the roots. Provides 6 to 8 weeks residual weed
control. Crop rotation restriction currently at 6 months for all rotational crops except sugarbeet
(24 months and field bioassay required).

Epic (Bayer) - 58DF
Mode of action: acetamide + carotenoid inhibitor
a.i.: flufenacet (one component in Axiom) + isoxaflutole (Balance)
Crops: Corn

    Comments: Registration granted in 1999. Full spectrum annual grass and broadleaf weed control
applied PPI or PRE.

Leadoff (DuPont)
Mode of action: acetamide + photosynthesis inhibitor
a.i.: dimethenamid + atrazine
Crops: Corn

    Comments: Same as Guardsman by BASF. Contains 2.33 lb ai/gal Frontier and 2.67 lb ai/gal atrazine.

Paramount (BAS 589) (BASF) - In USA
Accord 75DF (BASF) - In Canada
Mode of action: Plant growth regulator
a.i.: quinclorac
Crops: Wheat, fallow, sorghum, and noncropland

    Comments: Registration for fall and preplant applications granted in April 1999. Registration for
in-crop use expected in 2000 or 2001. Use rates are 0.17 to 0.33 lb/A. Has shown excellent activity
on foxtail, barnyardgrass, cleavers, volunteer flax, and sowthistle in Canada. Most crops may be planted
one year after application except flax, chick pea, field pea, and sugarbeet which must wait for 24 months
after application before planting. Accord antagonizes Assert. Use only MSO adjuvant. Used in Canada
to control DNA/ACCase resistant green foxtail. U.S. research show greater consistency of field bindweed
control at rates 0.37 to 0.5 lb ai/A. Will require multiple applications if use less than 0.37 lb ai/A.

Pursuit Plus (American Cyanamid)
Mode of action: DNA + ALS inhibitor
a.i.: pendimethalin + imazethapyr
Crops: Soybean

    Comments: Contains Pursuit + Prowl. First time a form of Pursuit herbicide is allowed to be used
soil applied in ND. Rate of 1.8 pt/A is 3/4 of mid-west rate. 1.8 pt/A = Pursuit at 3 fl oz or 1.08 oz
WDG/A + Prowl at 1.75 pt/A. Additional Prowl up to 1.75 pt/A may be added. Allowed in ND south
of Hwy 2. Use in Roundup Ready soybean at 2.5 pt/A followed by 1 pt/A Roundup Ultra + nonionic
surfactant + AMS. Testing in dry beans and field peas will be pursued for future registration.

Turbo (Novartis)
Mode of action: acetamide + photosynthetic inhibitor
a.i.: metolachlor + metribuzin
Crops: Soybean

    Comments: Contain Dual + Sencor. Was a Bayer product until 1999. Novartis has marketing rights
to Turbo in soybean beginning in 1999. New Novartis label does not allow use in potato. Pre-1999 Turbo
with a Bayer label is in supply and can be used for weed control in potato.

Toilet Water/Mouse Milk/Scam Brew
a.i.: granis thiothine EDA pyrazine dylum dibromide
Crops: All crops

    Comments: Official name of product is not known but has been represented (telemarketing) to control
most all weeds in most every crop at a cost of $90/gal. Regardless of the claims, and if it seems to good to
be true - it is too good to be true. Don’t succumb to temptation - DON’T BUY IT. In fact if isn’t listed in
the 1999 ND Weed Control Guide its either illegal or not worth knowing.

Richard Zollinger
NDSU Extension Weed Specialist


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