NDSU Crop and Pest Report
Weeds


ISSUE 4   May 27, 2004

HERBICIDE UPDATE PART II

Acetochlor (Monsanto and Dow)

Mode of action: Unknown
a.i.: Acetochlor with Harness and Surpass as brand names.
Crops: Rotation crops.
Comments: In 2004, EPA will be working to complete all science reviews of acetochlor in anticipation of issuing a reregistration eligibility decision (RED) in 2005. Acetochlor is being reviewed in conjunction with the conditions of registrations established in 1994 and as part of EPA's program to ensure older pesticides meet current health and environmental safety standards. It is anticipated that, along with the reregistration eligibility decision, EPA will also complete reviews of tolerance petitions which have been pending for several years, awaiting EPA's revised aggregate and cumulative risk assessments. This has been the major roadblock that the agency has cited for not being able to act on several rotational crops including potato, sugarbeet, sunflower, dry edible bean, and others. The agency should act on the petitions that have been submitted for quite some time. Unfortunately, acetochlor does not fit any of the agency's "priority" criteria that would hasten action.

ET (Nichino America)

Mode of action: PPO Inhibitor
a.i.:
pyraflufen
Crops: Various
Comments: ET was registered in April 2003 and currently is used as a preplant herbicide in corn, soybean, and wheat. Non-crop uses include chemical fallow, turf and as a potato vine desiccant. The North Dakota distributor is Helena Chemical Company. ET has a narrow broadleaf spectrum and should be included as a tank-mix with other herbicides like glyphosate, 2,4-D, dicamba.

Everest (Bayer)

Mode of action: ALS inhibitor
a.i.:
flucarbazone
Crops: Wheat
Comments: The ND D of Ag has issued a Special Local Needs registration ND-040002 to Arvesta Corporation to allow aerial applications of Everest 70 WDG (EPA Reg. No. 66330-49) on wheat in North Dakota. Expiration date: March 3, 2009 Supplemental labeling:

Gowan - Monsanto Company, Gowan Company and Margarita have signed a definitive agreement and the sale of certain Monsanto triallate chemistry assets. The agreement includes product registrations, registration data, trademarks, business information, as well as manufacturing and formulation know-how. Triallate is sold under the brand names of Avadex, Buckle, Far-Go and Fortress.Through its affiliated companies Gowan Company will incorporate the triallate brands into their existing herbicide product line, which includes a variety of herbicides for specialty agriculture. Gowan also has aquired EPTC for use in dry beans and other crops and halosulfuron (Sandea) which has the same active ingredient as Permit in corn.

Headline (BASF)

Crops: Wheat
Comments: May apply Headline fungicide at 3 fl oz/A with selected herbicides on 4 to 5-leaf wheat to help reduce incidence of wheat diseases. Also allows for application at 6 fl oz/A between flag leaf and heading.

Prowl H20 (BASF)

a.i.: pendimethalin - 3.8 lb/gallon water-based product.
Crops: Same crops as the 3.3 lb/gallon oil-based product but a lower product use rate/A.

Pursuit (BASF)

Mode of action: ALS inhibitor
a.i.: imazethapyr
Crops: Several
Comments: May apply PPI and PRE in dry beans, field pea, lentil and chickpea. Excellent season-long nightshade control. Crop Development Centre (CDC) in Saskatoon is working on an imidazolinone resistant lentil line that would tolerate POST applied Pursuit or Raptor.

Silverado Wild Oat Herbicide (Bayer)

Mode of action: ALS inhibitor
a.i.:
mesosulfuron + mefenpyr safener
Crops: HRS and durum wheat.
Comments: New for 2004. Apply at 1.75 to 2.25 oz/A prior to jointing wheat and 1-leaf to 2-tiller wild oat. Will control wild oat, including ACC-ase resistant wild oat, mustard species and volunteer canola. The price to the grower is around $8.75/A + the MSO adjuvant. See Silverado sell sheets for approved adjuvants.

 

HERBICIDE PRICES

Because the ND Weed Guide is printed in December before the new herbicide prices are released for the coming season, the prices in the 2004 edition are not accurate. Herbicide prices in the back of the 2004 ND Weed Control Guide are for 2003. For an approximate retail price listings for small quantities of herbicides refer to the NDSU Weed Science web site (also listed on the cover of the weed guide):

http://www.ag.ndsu.nodak.edu/weeds  

Herbicide prices do not include cost of such additives as surfactants, oils, fertilizer or application costs. Prices may vary depending on area of the state, wholesaler, bulk discounts, seasonal changes, quantities purchased and particular programs the manufacturing company offers. Prices are averages based on statewide dealer survey for small quantities. Producers should consult local agricultural product suppliers for exact price of each product in their area.

Richard Zollinger
Extension Weed Specialist
r.zollinger@ndsu.nodak.edu


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