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ISSUE 7   June 15, 2000

 

DISCOVER HERBICIDE REGISTERED IN WHEAT

    Discover (clodinafop) at 3.2 fl oz/A plus DSV adjuvant at 10.2 fl oz/A controls wild and volunteer oat, barnyardgrass, canarygrass, and volunteer corn and at 4 fl oz/A plus DSV adjuvant at 12.8 fl oz/A controls green, yellow, and giant foxtail, Persian darnel and annual ryegrass in wheat, including durum. Discover and DSV adjuvant are packaged in one box in separate containers. Add both herbicide and adjuvant in spray tank and apply at 40 (4 fl oz/A) or 50 (3.2 fl oz/A) acres per box. Wheat has excellent tolerance to Discover. Discover does not contain nor require a safener for wheat safety. Apply Discover with at least 10 gpa by ground or 5 gpa by air. Apply Discover to wheat from 2-leaf to emergence of 4th tiller. Discover will control foxtail in the 1- to 5-leaf stage and wild oat in the 1- to 6-leaf stage. Grasses should be actively growing but Discover control grass weeds over wide environmental conditions. Discover can be applied with many herbicides, insecticides, and fungicides labeled in wheat. Discover is antagonized much less than other grass herbicides labeled in wheat when tank-mixed with other pesticides. See label for approved tank-mix options.

    Contact your local Novartis rep or refer to www.cp.us.novartis.com/ for a copy of the complete label. North Dakota has issued a Section 24c (SLN) label emending the Section 3 label to allow any crop to be planted 30 days after application.

 

QUESTIONS AND ANSWERS

    Question: Do we have a standard recommendation for a herbicide program for Roundup Ready Soybean? The question comes up because I have been asked if a pre-emergent should be used on ground that will be seeded to RR Soybean. What are your thoughts? Also do we have any information on Extreme, I believe it is (Roundup + Pursuit).

    Answer: If the manufacturer answers the question they would probably say - use more Roundup. I do not know nor am able to keep up on program rebates and rewards. I don't know what restrictions are in place in 2000 for tankmixes or soil followed by POST application of herbicides other than Roundup.

Basically there are two camps of thought:

1. Use one or more applications of Roundup.

2. Use of a residual that covers the weaknesses of Roundup like wild buckwheat, nightshade, dandelion,
    marestail/horseweed, small kochia, ragweed (some reports), nutsedge, smartweed, common mallow,
    biennial wormwood, and waterhemp.

    There are products that "makes sense" if one chooses the residual route: Pursuit or Authority. Both products have good season long residual, covers the weaknesses of RU and are priced in manner that makes it very competitive with #1 above.

    Extreme (Pursuit + RU) will be very popular because the cost is less than $10/A and controls a wide range of annual and perennial weeds.

    Authority applied PRE alone or followed by Roundup controls many important weeds in soybeans, has 6 to 8 weeks residual weed control, cost around $14/A for the highest rate and is the only herbicide that consistently and adequately controls biennial wormwood. NDSU trials have shown excellent weed control with Authority PRE followed by Roundup postemergence.

    Another herbicide that will be important, especially in the future, with several weeds becoming resistant to ALS mode of action herbicides is Flexstar/Reflex. Flexstar/Reflex control many broadleaf weeds found in North Dakota and is very economical. Flexstar/Reflex has a soil residue. Raptor and Flexstar/Reflex have similar crop rotation restriction. See product labels for restriction of crops that cannot be planted the following year.

 

SOYBEAN HERBICIDE UPDATE

BestShot (Dow)

Mode of action: ALS inhibitor + glyphosate

a.i.: cloransulam tankmixed with glyphosate

Crops: Roundup Ready soybean

Comments: A Dow program of a one-pass tankmix of FirstRate + Glyphomax or Glyphomax
                    Plus for grass and improved broadleaf weed from Dow. FirstRate will provide
                    residual control of some broadleaf weeds.

 

Boundary (Novartis)

Mode of action: Acetanilde +Photosynthetic inhibitor

a.i.: metolachlor + triazine

Crops: Soybean

Comments: Contains 6.3 lb/gallon of active isomer of metolachlor + 1.5 lb/gallon of metribuzin.
                    The rate of 1.5 pt/A of Boundary gives 1.24 pt/A of Dual II Magnum and
                    6 oz DF/A of Sencor. Compared to Turbo it is more metolachlor and less metribuzin.
                    Marketed in the Roundup Ready soybean system.


Extreme (Amnerican Cyanamid)

Mode of action: ALS inhibitor +glyphosate

a.i.: imazethapyr + glyphosate (Pursuit + Roundup Original)

Crops: Soybean

Comments: ND rate is 2.25 pt/A and is equivalent to 3 fl oz/A of Pursuit and 18 fl oz of
                    Roundup Original. Price is less than $10/A. Nonionic surfactant (NIS) and
                    ammonium sulfate (AMS) fertilizer are required. Formulated adjuvant products
                    containing NIS and AMS are currently available which accomplished the adjuvant
                    load requirement. Some brand names to choose from are Sensation from Rosens
                    and Surfate from AGSCO. Extreme can be used in all of ND and in MN North
                    of Hwy #210.


Harmony GT (DuPont) 75DF

Mode of action: ALS inhibitor

a.i.: thifensulfuron

Crops: Soybean.

Comments: DuPont has issued a supplemental label for Harmony GT on soybeans in ND,
                    MT, MN (North of Hwy 28), and SD (North of Hwy 212).
                    Rate: 0.083 oz 75DF/A = 1/12 oz 75DF/A
                    Adjuvants: NIS with or without nitrogen fertilizer
                    Weeds: Wild mustard, annual smartweeds, lambsquarters, pigweed,
                    and velvetleaf. Suppression of sunflower and cocklebur.
                    Label allows tankmix with post grass herbicides, Basagran, and Galaxy.
                    The label does not recommend tankmix of Harmony GT with Pursuit.
                    See label for reasons. Other soybean herbicides labels may allow a tankmix
                    with Harmony GT. See individual labels.


Reflex (Zeneca)

Mode of action: PPO inhibitor

a.i.: fomesafen - Same as Flexstar without oil adjuvant.

Crops: Soybean and possible Section 18 on dry bean.

Comments: 2000 Section 18 submitted for ND/MN for use in dry bean for control of
                    ragweed. Data from MI indicates less dry bean crop injury than Basagran.
                    E control of ragweeds, vol sunflower, cocklebur and other weeds.


Rezult (BASF)

a.i.: bentazon +sethoxydim

Crops: Soybean and possibly dry beans and field pea

Comments: Price reduced to approximately $14/A - cheaper than Basagran alone.


Roundup (Monsanto)

Mode of action: EPSP synthase inhibition

a.i.: glyphosate

Crops: Various

Comments:. Licensed glyphosate tolerant 1999 soybean seed cannot be replanted. Based
                     on information available, we are not aware of options that allow planting 1999
                     seed after paying the required fees.

Roundup is off patent in October of 2000

 

Glyphosate is available under the following labels:
Roundup Ultra/RT (Monsanto)
Glyphomax Plus (Dow)
        Formulated as an isopropyl amine salt at 4 lb ai/gal or 3 lb ae/gal with full adjuvant load.

Roundup Ultra Dry (Monsanto)
        Formulated as an ammonium salt as a 65% SG with full adjuvant load.
        (RUU ltra Dry at 1.15 lb =1qt/A Ultra)

Roundup Original/RT (Monsanto) or
Glyfos (Cheminova) or
Glyphomax (Dow) or
Private Labels (Various)
        Formulated as an isopropyl amine salt at 4 lb ai/gal or 3 lb ae/gal with partial adjuvant load.

Touchdown (Zeneca)
        Formulated as an trimethyl sulfonium salt at 5 lb ai/gal or 3.45 lb ae/gal with partial adjuvant load.  
        1.6 pt/A of Touchdown = 2 pt Roundup Original

Roundup Ultra Max (Monsanto)
        Formulated as an isopropyl amine salt at 4 lb ai/gal or 3 lb ae/gal with full adjuvant load.

Roundup Custom (Monsanto) or Rodeo (Monsanto)
        Formulated as an isopropyl amine salt at 5.4 lb ai/gal or 4 lb ae/gal without adjuvants.

Do not add NIS: Roundup Ultra/RT, Roundup Ultra Dry, Roundup Ultra Max.

Add NIS at 0.5% v/v: Roundup Original/RT, Private Labels, Glyfos, Touchdown.

Add NIS at 1% v/v: Roundup Custom, Rodeo.

Only the Rodeo formulation of glyphosate can be applied on water. Rodeo does not contain adjuvants toxic to fish and aquatic life. An NIS must be used with Rodeo. Some NIS adjuvants labeled for use on water are: Agridex, Aberchem Aquatic surfactant, Side-Kick, Side-Kick II, Induce, Liqua-Wet, X-77, Passage, Prospreader Activator, R-11, Spreader Sticker, Super Spread 200, Sure-Fact, Triton Ag 98, and Widespread.

Trade Name

Mnfctr

Active ingredients
gly = glyphosate

lb ai/gal,
gly = lb ai/gal

Acquire

BASF

glyphosate

N/A

Backdraft

Am. Cy.

imazaquin + gly

0.25 + 1.25

Campaign

Monsanto

glyphosate + 2,4-D

1.2 + 1.9

Extreme

Am. Cy.

imazethapyr+gly-ipa

0.17 + 2

Fallowmaster

Monsanto

gly-ipa+dicamba acid

1.1 + 0.5

FieldMaster

Monsanto

acetochlor+atrazn+gly

2 + 1.5 + 0.56

Gly-Flo

Micro Flo

glyphosate-ipa

3

Glyfos

Chemnva

glyphosate-ipa

3

Glyphomax

Dow

glyphosate-ipa

3

Glyphomax Plus

Dow

glyphosate-ipa

3

Glyphosate Orig.

Griffin

glyphosate-ipa

3

Landmaster BW

Monsanto

gly-ipa + 2,4-D-ipa

0.9 + 1.5

Protocol

Monsanto

glyphosate-ipa

3

Rattler

Helena

glyphosate-ipa

3

ReadyMaster ATZ

Monsanto

atrazine + gly

2 + 1.5

Rodeo

Monsanto

glyphosate-ipa

4

Roundup Custom

Monsanto

glyphosate-ipa

4

Roundup Original

Monsanto

glyphosate-ipa

3

RU Original RT

Monsanto

glyphosate-ipa

3

RU SoluGran

Monsanto

glyphosate-NH3

86.5%

RU/Private labels

Various

glyphosate-ipa

3

Roundup Ultra

Monsanto

glyphosate-ipa

3

Roundup Ultra RT

Monsanto

glyphosate-ipa

3

RU Ultra Dry

Monsanto

glyphosate-NH3

65%

RU Ultra Max

Monsanto

glyphosate-ipa

3.7

Silhouette

Various

glyphosate-ipa

3

Touchdown

Zeneca

glyphosate-tms

3.45

   Roundup as a preharvest registration in dry beans may be approved for use in 2000. Rates will be limited to 1 qt/A.

    Studies in MN, NE, and KS confirm less weed control from application made after 6:00 pm. IA observed similar results with Pursuit.

Touchdown 5E (Zeneca)

Mode of action: EPSP synthase inhibitor

a.i.: Trimethyl sulfonium salt of glyphosate (NOT sulfosate).(Same active ingredient as
        Roundup but a different salt.)
        Roundup/Ultra/RT = glyphosate -sopropylamine salt
        Touchdown = glyphosate - trimethyl sulfonium (trimesium).

Crops: Various Roundup Ready crops

Comments: Previously registered only in noncrop uses. Negotiations with Monsanto will allow
                    Touchdown on most Roundup Ready crops in future. Touchdown 5E contains some
                    and requires additional NIS to be added. Touchdown is NOT registered on Roundup
                    Ready corn and may cause serious injury to corn.  Touchdown is registered on
                    Roundup Ready soybean with good soybean tolerance. In a few cases, Touchdown
                    may slight yellow flecking on sprayed leaves resulting in NO yield loss. Leaves
                    emerging after application are normal and not affected


Ultra Blazer (BASF)

Mode of action: PPO inhibitor

a.i.: acifluorfen-Na salt

Crops: Soybean

Comments: A new formulation of Blazer with Ion Charge Technology that supposedly
                    produces soybean response similar to Flexstar but less than Cobra. No NDSU
                    studies have been conducted with Ultra Blazer.

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


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