NDSU Crop and Pest Report
Weeds


ISSUE 2  May 9, 2002

 

NDSU WEED TOURS

** The 2002 NDSU Weed Tour will be (may be) held Tuesday, July 2, 2000. Below is the tentative schedule with locations and times (if it doesn’t rain). I hesitate to print a date because my colleagues have made it clear that there is direct correlation between weed tour date selected and massive rain events. Perhaps this year will be different.

8:30 - 10:00 - NDSU Experiment Station - Prosper, ND

10:30 - 12:00 - NDSU Agronomy Seed Farm, Casselton, ND

Lunch - TBD

1:30 - NW-22 Research Farm, Fargo, ND  (SW corner of I-29 and County Rd 20)

OR

North of the Airport (County Rd 20) for tour of sugarbeet weed control plots with Dr. Alan Dexter for those interested in sugarbeet weed control research or biennial wormwood tour with Dr. George Kegode for those interested in biennial wormwood research.

Plot booklets will be available along with a guided tour of field research experiments. Researchers will guide attendees through their experiments to explain the objectives of the experiment, discuss study treatments, and answer questions.

Experiments include: Wild oat and broadleaf weed control in wheat, weed control in corn, soybean, dry bean, flax, field pea, chick pea, and sunflower, onion, potatoes, carryover, glyphosate, adjuvant, biennial wormwood control and biology studies, application technology with variable rates, speed, and gallonage, and nozzle studies.

** Tour of leafy spurge control in Western Prairie Fringe Orchid experiments in the Sheyenne National Grasslands near Lisbon, ND on July 3. Dr. Rod Lym will lead this tour. Contact Dr. Lym for more information regarding tour time and travel arrangements.

 

GLYPHOSATE LABELED FOR PREEMERGENCE USE IN FLAX

Supplemental labeling has been issued allowing Roundup Ultra Max to be applied preplant, preemergence, and at planting for flax. Labels will be posted shortly at the CDMS web site.

 

FLAX AS INFLUENCED BY GLYPHOSATE

Glyphosate herbicide has been used by flax producers as a burndown treatment both preemergence and preplant. 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. 

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

Treatment
timing

Plants/M2

% stand

Yield
Bu/A

Untreated

332

100

29.1

7 days prior

293

88

28.3

1 day prior

223

67

25.5

3 days after

280

84

26.3

Source: 23rd Man-Dak Zero Till proceedings - 2001

Dr. Dave McAndrews, Agric. and Agri-Food Canada, Morden, MB.

This information was provided by Duane R. Berglund, NDSU Extension Agronomist.

 

2002 HERBICIDE UPDATE - SMALL GRAINS

AE 1715 (Aventis)

Mode of action: ALS inhibitor
a.i.: iodosulfuron
Crops: Potential use on small grains and corn.
Comments: Broadleaf weed control. Tank-mixed with mefenpyr-diethyl enhances metabolism and detoxification in cereals but not in weeds.

Aim (FMC)

Mode of action: PPO inhibitor
a.i.: carfentrazone
Crops: Small grains, barley, oat , corn.
Comments: New liquid 2EW formulation available for 2002. Labeled for preplant burndown and fallow prior to planting field corn, soybean and wheat with no planting interval restrictions since these crops are labeled and have established tolerances. 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. Crops without a tolerance must be planted 30 days or more after application.

Ally XP (DuPont)

Mode of action: ALS inhibitor
a.i.: metsulfuron
Crops: Small grains.
Comments: New formulation - more soluble with tankmixes and resuspend better.

Ally Extra (DuPont)

Mode of action: ALS inhibitor
a.i.: metsulfuron + thfensulfuron + tribenuron
Crops: Small grains.
Comments: Active ingredients formulated together as a 71.25DF instead of a co-pack Canvas = Ally + Harmony Extra.

Beyond (BASF)

Mode of action: ALS inhibitor
a.i.: imazamox / imazapyr
Crops: Clearfield wheat
Comments: Clearfield winter wheat is available for 2002 but Clearfield winter wheat is still under development and will not be available until 2005 or 2006.

Bronate Advanced (Aventis)

a.i.: bromoxynil ester + MCPA ester
Crops: Same as Bronate.
Comments: 5 lb/gal as opposed to Bronate at 4 lb/gal.

Buctril (Aventis)

a.i.: bromoxynil octanoic + heptanoic ester
Crops: Same as Buctril.
Comments: 4 lb/gal as opposed to Buctril 2 lb/gal.

Clincher (Dow)

Mode of action: ACCase inhibitor
a.i.: cyhalofop
Crops: Potential use on small grains.
Comments: POST grass control.

Everest (Bayer)

Mode of action: ALS inhibitor
a.i.: flucarbazone
Crops: Wheat
Comments: 2ee label issued allowing 0.4 oz rate to be used for green foxtail control west of Hwy 281 in ND. I wonder if it will work on the east side of 281?

Harmony GT (DuPont) 75DF

Mode of action: ALS inhibitor
a.i.: thifensulfuron
Crops: Small grains
Comments: Harmony GT provide excellent control of wild buckwheat at the small grain rate. NDSU data show an average of 92% control from rates ranging from 0.12 to 0.5 oz ai/A (labeled rates in wheat are 0.225 to 0.45 oz ai/A).

JV 485 (Bayer and Monsanto)

Mode of action: ?
a.i.: fluazolate
Crops: Potential use on wheat.
Comments: Pre control of broadleaf and some grass weeds.

Lotus (BASF)

Mode of action: PPO inhibitor
a.i.: cinidon
Crops: Unknown status on small grains.
Comments: POST control of broadleaf weeds.

Metgard (Makhieshim-Agen of N. Am.)

Mode of action: ALS inhibitor
a.i.: metsulfuron (60DF)
Crops: Same as Ally
Comments: Metsulfuron is now off patent allowing other sources to be sold in the U.S under several different trade names.

Olympus (Bayer) - 70DF

Mode of action: ALS Inhibitor
a.i.:
propoxycarbozone
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.

Primus/Boxer (Dow)

Mode of action: ALS inhibitor
a.i.: floransulam
Crops: Labeled in Canada in small grains.
Comments: POST broadleaf weed control especially catchweed bedstraw (Galium).

UBH-820 (Ube Industries)

Mode of action: Phytoene desaturase inhibitor
a.i.: beflubutamid
Crops: Potential use in small grains.
Comments: POST broadleaf weed control.

Richard Zollinger
NDSU Extension Weed Specialist
rzolling@ndsuext.nodak.edu


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