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ISSUE 2  May 10, 2001



Glyphosate herbicide has been used by flax producers as a burndown treatment both preemergence and preplant. Please note: It is currently not labeled for such a use in flax production in the U.S.

Research reported in Canada has shown that this practice can be detrimental to flax stands and yield. The research was conducted in a low disturbance, high residue system of seeding flax into a cereal stubble. Data is shown in Table 1 and is averaged over three years. Note that 33% stand reduction occurred when glyphosate was applied one day prior to planting the flax. A yield reduction of 2.8 bu/A and 3.6 bu/A resulted when glyphosate was applied 3 days after seeding and 1 day prior to seeding flax, respectively when compared to the untreated check. This injury is caused to flax seedlings as they emerge through the treated crop residues and stubble remaining from the previous cereal crop. Moisture conditions such as light rains or heavy dew can increase the injury. The glyphosate treatment 7 days before seeding flax did reduce stand slightly but no significant yield reduction. Less injury was noted if conditions remain dry. The cereal residue itself does not appear to cause injury since other studies with the residue removed did not appear to result in any flax injury. This is a caution not to use this practice of glyphosate burndown treatment prior to seeding flax as it is not labeled for such as use!!

Table 1. Influence of glyphosate on Flax - 1996-1998

Treatment timing


% stand






7 days prior




1 day prior




3 days after




Source: 23rd Man-Dak Zero Till proceedings - 2001 
Dr. Dave McAndrews, Agric. and Agri-Food Canada, Morden, MB.


Duane R. Berglund
Extension Agronomist




Raptor on Clearfield canola was listed as Section 3 federal registration. It is only registered as a Section 18 for 2001.



Aim (FMC)

Mode of action: PPO inhibitor
Crops: Small grains, barley, oat , corn.
Comments: DO NOT USE IN SOYBEAN! Labeled for preplant burndown and fallow prior to planting field corn, soybean, wheat, barley, oat, sorghum, buckwheat, and millett with no planting interval restrictions since these crops are labeled and have established tolerances. Aim can be applied preplant to other all other crops not listed BUT planting must be delayed for 30 days following application. Aim can also be used on fallow which includes CRP but do not use if the legume has emerged. Aim + Roundup enhances the speed of activity and adds control of susceptible weeds kochia, lambsquarters and pigweed. May provide partial control of wild buckwheat and Russian thistle.

Balance/Pro (Aventis)

Mode of action: Pigment inhibitor
Crops: Corn. Potential use in chickpea, wheat and barley.
Comments: New liquid formulation (4SC) available as Balance Pro.

Callisto (Syngenta)

Mode of action: Carotenoid inhibitor - same as Balance
mesotrione (ZA1296)= Reduced Risk Classification
Crops: Corn
Comments: Registration expected in 2001. POST up to 30 inches tall. Symptoms are plant bleaching. Caution with Counter or tankmix with an OP. Active ingredient is based on secreted allelochemicals from Callistemon citrinus (Bottlebrush) after observing significantly less weed competition than plants around it. 9 day half-life - no carryover expected. Possible dicamba replacement.

Define (Bayer and Aventis)

Mode of action: Unknown
Crops: Corn and soybean.
Comments: Sold alone instead of only in premix as Axiom, Domain, Epic, etc. Aventis controls and services Define distribution in corn but the product is being co-marketed with Bayer. Requires water for activation. Crop rotation restrictions limit use in ND. Possible registration in wheat for soil-applied foxtail control.


Phase out: Scorpion III, Broadstrike + Treflan.  Will co-market Rodeo and Accord with Monsanto.

Eptam/Eradicane (Cedar Chemical)

Mode of action: Unknown
a.i.: EPTC
Crops: Dry beans, potatoes, corn.
Comments: Sold by Zeneca to Cedar Chem.

Everest (Bayer) - 70DF

Mode of action: ALS Inhibitor
Crops: Wheat, including durum and winter - NOT BARLEY..
Comments: For wild oat and green foxtail control. Has shown residual foxtail control. Use NIS and combine with another broadleaf herbicide. Suppresses yellow foxtail. Apply NIS at 0.25 to 0.5% v/v for increased yellow foxtail control. 2,4-D provides safening. The mefenpyr in Puma also safens Everest. Possible tankmix at half rates to improve yellow foxtail control and provide safening.

Expert (Syngenta)

Mode of action: ALS inhibitor
1.73 lb s-metolachlor + 2.13 lb atrazine + 1 lb glyphosate.
Crops: Corn
Comments: Premix for Roundup Ready Corn.

Foramsulfuron (Aventis)

Mode of action: ALS inhibitor
foramsulfuron + safener (1:1 ratio)
Crops: Corn
Comments: Registration anticipated in 2002. An SU herbicide applied POST for control of many grass and broadleaf weeds including suppression of Canada thistle. Short residual with no cropping rotation restriction the following year. Weaknesses in weed control include Polygonum species like wild buckwheat and smartweed. May be formulated with other active ingredients in premix to increase spectrum of weeds controlled.

Hornet (Dow)

Mode of action: ALS inhibitor + Growth Regulator
flumetulam + clopyralid-K+
Crops: Corn
Comments: New K salt of clopyralid formulation contains 25% less ai than SP formulation but use rates will 25% more resulting in no change in ai/A (2 oz WDG = 1.6 oz SP. New formulation changes signal word from Danger to Warning.

Olympus (Bayer) - 70DF

Mode of action: ALS Inhibitor
Crops: Wheat, including durum and winter.
Comments: ALS mode of action - same as Everest. In development in HRS wheat and durum - NOT BARLEY - for control of annual bromes and cheat grass.

Outlook (BASF)

Mode of action: Acetamide (Mode of action unknown)
dimethenamid-P (active isomer). 6 lb ai/A
Crops: Same crops as Frontier.
Comments: Use rates are 55% of Frontier rates. Will replace Frontier in future. Pending registration on potato and sugarbeet.

Starane (Dow/UAP)

Mode of action: Plant growth regulator
a.i.: fluroxypyr
Crops: Registration on pasture/rangeland expected in 2001. Provides excellent common mallow control.


Phase out: Broadstrike + Dual, Turbo, Bicep MAGNUM TR, Dual, Dual II, Bicep, Bicep Lite II. Only MAGNUM formulations will remain.

Teamwork (Agriliance)

Mode of action: PPO + Triazine
a.i.: carfentrazone + atrazine
Crops: Co-pack for corn and sorghum.

Richard Zollinger
NDSU Extension Weed Specialist

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