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ISSUE 6   June 8, 2000

 

AIM INJURY TO SMALL GRAINS

    Early evaluations of spring small grain trials have indicated a substantial crop response to Aim (carfentrazone) herbicide, either alone or in tank-mixes. Injury seemed to be particularly significant this year and showed up within two days of application. Injury consisted of bleached and necrotic tissue on the upper leaves of the plant canopy. This injury rapidly faded, however, and most of the damaged tissue originally observed actually recovered and was green again by ten days after application.

    This response also has been observed in winter wheat and corn but to a lesser extent. Small necrotic spots will remain on effected leaf tissue, but this damage has never been shown to influence yield in research experiments. Aim is an effective tool in the control of some broadleaf weeds and provides an additional mode of action for tank-mixes in small grains. If Aim is a good choice for your weed control needs, there is no evidence that crop injury should change that decision.

Dr. Kirk Howatt
NDSU Small Grain Weed Science
khowatt@ndsuext.nodak.edu

 

ND SECTION 24c FOR ACHIEVEŽ 80 DG

    ND Department of Agriculture issued a Section 24c SLN label making available a U.S. label for the Canadian-registered herbicide AchieveŽ 80 DG using chemical price harmonization as the justification.

    North Dakota small grains producers and chemical dealers can purchase AchieveŽ 80 DG in Canada and apply it in North Dakota. Users can download the EPA approved label for AchieveŽ 80 DG from the North Dakota Department of Agriculture website at
www.agdepartment.com

or on the NDSU Pesticide Certification Website at:

http://www.ag.ndsu.nodak.edu/aginfo/pesticid/LabelPage.htm

with procedures to legally obtain AchieveŽ 80 DG from Canadian sources.

    Producers and dealers must have the EPA-approved AchieveŽ 80 DG label and supplemental label along with the original Canadian AchieveŽ 80 DG label in order to get the product through U.S. Customs. All labels must be affixed to each sealed container of product prior to transport from Canada to North Dakota. It is a violation to transport any pesticide into the U.S. without an EPA-approved label.

    AchieveŽ 40 DG has been available to U.S. producers, but the Canadian AchieveŽ 80 DG is approximately $6 per acre cheaper than the U.S. product AchieveŽ 40 DG after exchange rates are taken into account.

    AchieveŽ 80 DG is a product cited in last year's USDA study pointing out the pricing disparity between some chemicals used in the US versus similar or identical or identical products for sale in Canada. Other alternatives to AchieveŽ and their estimated per-acre costs include AvengeŽ ($19), PumaŽ ($17.60) and AssertŽ ($15).

 

QUESTIONS AND ANSWERS

Question: How do I control nightflowering catchfly in soybeans?

Answer: Nightflowering catchfly is an annual plants in the "Pink" or cockle family and is erect, slender, and covered with short sticky hairs. Pictures for identification are in many weed ID books. The plant can be confused with white cockle except white cockle is perennial and is not sticky. Seeds can remain dormant for many years and plants are tolerant to 2,4-D and MCPA.

    NDSU research indicates most POST soybean herbicides are ineffective. However, visual observation from weed scientists and graduate student indicate activity from Flexstar/Reflex with MSO oil adjuvant. Catchfly is densely covered with hairs so thorough coverage is essential


Question:
In the weed control guide you list a blend of Accent + Atrazine + Clarity + MSO adjuvant for weed control in corn. I used this last year and it worked well. If you were to replace the Accent and Clarity with Celebrity, what rate would you use of Celebrity. Also, do you see any problems with this mix?

Answer: Use of herbicides below labeled rates eliminates the manufacturer from ALL LIABILITY of weed control. If growers choose to use Accent, Celebrity, or Celebrity Plus below labeled rates - the user has no recourse from the chemical company.

    The NDSU Corn Micro-Rate is Accent at 0.33 to 0.67 oz DF/A + Atrazine at 0.38 lb ai/A + Banvel/Clarity at 4 fl oz/A + MSO type adjuvant at 1.5 pt/A or Quad 7 (several) at 1% v/v. Reduced Accent rates can be used for green foxtail and wild oat. DO NOT reduce rate of Accent, Celebrity or Celebrity Plus when the target grass weeds are yellow foxtail, barnyardgrass, wild proso millet or quackgrass.

    Celebrity (Accent + Banvel/Clarity) is a discontinued product replaced by Celebrity Plus (Accent + dicamba + diflufenzopyr). Reducing the rate Celebrity would essentially give the exact same amount of product in the NDSU Corn Micro Rate: Accent at 0.33 oz DF/A + Banvel/Clarity at 4 fl oz/A.

    The label rate of Celebrity Plus is 4.67 oz WDG/A (4 oz Distinct + 0.67 oz Accent). A half rate of C-Plus would give 0.33 oz DF/A Accent + 2 oz WDG/A Distinct (equivalent to 2 fl oz/A Banvel/Clarity BUT also contains diflufenzopyr).

    NDSU research has found that Celebrity Plus at half rate + MSO or Quad 7 gives the same weed control as the NDSU Corn Micro-Rate. Plus there is no restriction for using an oil adjuvant on the Celebrity Plus label that is present with Banvel/Clarity.

    As far as problems - I see none because the rate of dicamba is only 0.0625 lb ai/A at the reduced rate which should greatly reduce risk of any corn injury. The Celebrity Plus application window shows up to 24 inch tall corn. However, to avoid corn injury, apply it at the same timing and application window as Banvel/Clarity.

 

CORN HERBICIDE UPDATE

Acuron Gene (Novartis Chemical Co)

Mode of action: PPO inhibitor

a.i.: All PPO inhibitor herbicides

Crops: Many transgenically developed crops

Comments: Patented ‘Acuron’ gene will be inserted into different crops like corn to
                    confer resistance to reduced risk PPO herbicide. Some PPO herbicides in
                    development will have greater soil residue than those on the market. University
                    expected trials in 2001. Transgenic crops to be developed are corn, sugarbeet,
                    wheat, cotton, soybean, rice, canola, and sorghum. Acuron will be available in
                    more than Novartis seed lines.

 

Action 4.75WP (Novartis)

Mode of action: PPO Inhibitor

a.i.: fluthiacet (proposed) 1.14 to 4.28 oz/A

Crops: Corn and soybean

Comments: Registration on hold. Contact, nonresidual broadleaf herbicide. Corn leaf burn
                    may occur with some adjuvants and hot weather. Narrow weed spectrum velvetleaf,
                    pigweed, lambsquarters, and nightshade.

 

AE F130360 (Aventis)

Mode of action: ALS inhibitor

a.i.: foramsulfuron + safener (1:1 ratio)

Crops: Corn

Comments: Registration anticipated in 2002. An SU herbicide applied POST with control
                    of many grass and broadleaf weeds including Canada thistle. Short residual with
                    no cropping rotation restriction the following year. Weaknesses in weed control
                    include Polygonum species like wild buckwheat and smartweed.

 

Celebrity (BASF)

Mode of action: ALS inhibitor + Plant growth regulator

a.i.: Nicosulfuron (Accent 75DF) + dicamba-Na 70WDG

Crops: Corn

Comments: Will be phased out and replaced by Celebrity Plus.

 

Celebrity Plus (BASF)

Mode of action: ALS inhibitor + Plant growth regulator

a.i.: Accent (nicosulfuron) + Distinct (dicamba-Na + diflufenzopyr-Na 70WDG)

Crops: Corn

Comments: Will replace Celebrity.

 

Distinct (BASF)

Mode of action: Plant growth regulator

a.i.: (dicamba-Na + diflufenzopyr-Na 70WDG)

Crops: Corn

Comments: Will replace Celebrity in corn.

Crops: Noncropland

Comments: Label allows application to fencelines, fallow, rights-of-way, and noncrop sites.
                    Distinct controls several broadleaf weeds and has demonstrated very good
                    Canada thistle control. This labeling provides an additional option for noncropland
                    (not hayed or grazed) areas. Rates are 4 to 6 oz WDG/A. Use 4 oz/A for annuals
                    and 6 oz/A for perennial weeds. Use a nonionic surfactant at 1 qt/100 gallons water
                    or 0.25% v/v and AMS at 8.5 to 17 lb/100 gallons water. Distinct registration on
                    fallow has been submitted to EPA.

 

DPX 79406 (DuPont)

Mode of action: ALS inhibitor

a.i.: nicosulfuron + rimsulfuron - the component in Accent Gold without Hornet and Basis Gold
       without atrazine.

Crops: Corn

Comments: Registered as stand alone product in the high plains then into ND. Will allow user
                    to add broadleaf herbicide of choice.


Hornet (Dow)

Mode of action: ALS inhibitor

a.i.: flumetsulam + clopyralid

Crops: Corn

Comments: Supplemental labeling allows aerial application using a minimum of 5 gpa water.

 

Liberty (Aventis)

a.i.: glufosinate

Crops: Libert resistant corn.

Comments: Program where 28 fl oz/A cost $17.50 with rebate.

 

Outlook (BASF)

Mode of action: Acetamide (Mode of action unknown)

a.i.: S-dimethenamid (active isomer). 6 lb ai/A

Crops: Same crops as Frontier.

Comments: Use rates are 55% of Frontier rates. Will replace Frontier in future. Registration
                    in potato and sugarbeet expected in 2001.

 

ZA1296 (Zeneca)

Mode of action: Carotenoid inhibitor - same as Balance

a.i.: mesotrione = Reduced Risk Classification

Crops: Corn

Comments: Registration expected in 2002. Experimental broadleaf herbicide for PRE and
                    POST up to 30 inches tall. Symptoms are plant bleaching. Will not be used after
                    Counter in-furrow nor a tankmix with an OP. An mesotrione/acetochlor tankmix
                    registration expected in 2001.

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


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