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ISSUE 5  June 1, 2000

 

QUESTIONS AND ANSWERS

    Question: Do I need to add extra nonionic surfactant with Celebrity Plus when I use Quad 7 (or other Basic Blend adjuvants)?

    Answer: The Celebrity Plus label specifies additional fertilizer when a nonionic surfactant is used. However, Quad 7 is not a nonionic surfactant but rather a basic blend adjuvant. NDSU research has shown excellent weed control from Celebrity Plus + Quad 7/Basic Blend adjuvants and NO additional fertilizer is needed. Weed control when Basic Blend adjuvants were used in most cases was greater than nonionic surfactant + fertilizer and greater than or equal to petroleum oil (COC/PO) and methylated seed oil (MSO) adjuvants.

    Quad 7 is a non-oil, basic blend adjuvant and is different from additives which lower spray solution pH. Quad 7 increases water pH which increases water solubility of certain herbicides, such as Accent, Pursuit, Raptor, and UpBeet. For example, Accent solubility at water pH of 5 is 360 mg/L, at 7 is 12,200 mg/L, and at 8 is 39,200 mg/L. Quad 7 has also been shown to minimize precipitation problems with Betamix/Betanex/Betamix Progress plus UpBeet at low rates by increasing water pH. Quad 7 contains nitrogen fertilizer that increases water pH, a premium surfactant that aids in retention, deposition, and
absorption, and a buffer.

    Research has shown that Quad 7 enhances weed control from Accent, Pursuit, and Raptor similar to MSO type adjuvants. Quad 7 may be used in those situations where oil adjuvants are restricted. For example, Clarity labels restrict oil adjuvants when used alone or in tank-mix with Accent on corn. Quad 7 is also less expensive at field use rates than MSO type adjuvants. Quad 7 is used at 1% v/v (1 gal/100 gal of water) and costs approximately $0.75/A at 5 GPA or $1.50/A at 10 GPA. Scoil and other MSO type adjuvants cost approximately $2.50 to $3.00/A at the 1.5 pt/A rate.

 

HERBICIDE UPDATE

Aim (FMC)
    Mode of action: PPO inhibitor
    a.i.:
carfentrazone
    Crops:
Barley and oat
    Comments:
Label expanded to include barley and oat expected. Aim has a label 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. The only recommendation for CRP is to be cautious if there is an emerged legume in the CRP which could be damaged from the Aim. Aim + Roundup enhances the speed of activity,  and adds control of weeds susceptible to Aim like kochia, lambsquarter and pigweed. Aim may provide partial control of wild buckwheat and Russian thistle. Crops such as sunflower that do not have an Aim tolerance must be planted30 days or more after application of Aim.

Assert (American Cyanamid) + Puma (Aventis)
    Mode of action: ALS inhibitor + ACCase Inhibitor)
    a.i.:
imazethapyr + fenoxaprop-P
    Crops:
Wheat
   Comments: A supplemental label has been issued by American Cyanamid allowing a tankmix of Assert + Puma at 0.9 pt/A     + 0.33 pt/A. Cost is equivalent to the full rate of Puma.

Avenge (American Cyanamid)
    Mode of action: Unknown
    a.i.:
difenzoquat
   Crops: Wheat
   Comments: A supplemental label has been issued by American Cyanamid allowing use on AC Barrie, AC Domain, Anza, Backup, Brooks, Cavalier, Colusa, Ernest, Forge, Hamer, HiLine, Kulm, Lars, McNeal, ND2375, Norlander, Oxen, Rich, Russ, Serra, Sharpshooter, and Yolo at a maximum rate of 2.5 to 3 pt/A.

Bronate Pro (Aventis)
    Mode of action:
Photosynthetic inhibitor +ACCase inhibitor
   a.i.: bromoxynil + MCPA + fenoxaprop + safener or Bronate + Puma.
   Crops: Wheat and barley
   Comments: A new label has been issued for Bronate Pro. Bronate Pro is a twin-pack of Puma and Bronate for grass and broadleaf weed control in winter wheat, spring wheat, and durum. The box contains a 1.65 gallon container of Puma (Pro One) and a 2.5 gallon container of Bronate (Pro Two). Each box will treat 20 acres, which equals Puma at 0.66 pints/A and Bronate at 1.0 pints/A. There will be limited quantities of Bronate Pro available in the 2000 growing season.

Discover (Novartis U.S.) - REGISTRATION PENDING.
   Horizon (Novartis Canada)
    Mode of action
: ACCase inhibitor
   a.i.: clodinafop
   Crops: HRS and durum wheat.
   Comments: Registered in Canada. U.S. registration expected first part of June. Excellent wild oat (reduced rates) and foxtail control. Wild oat is more susceptible than foxtail. Controls barnyardgrass. Less antagonism with broadleaf herbicides than fenoxaprop or Achieve. Do not use on barley. ND has applied for a Section 24c allowing use in ND with a modified rotational crop restriction allowing most all crops except some small grains to be planted 0 days after application.

Harmony GT (DuPont) 75DF
    Mode of action: ALS inhibitor
    a.i.:
thifensulfuron
   Crops: Small grains and soybean.
   Comments: Formulated as the original Harmony 75DF instead of 25DF in Pinnacle. Pinnacle will be phased out. GT stands for Grass Tankmix because of its limited antagonism with POST grass herbicides. EPA has been petitioned to allow use on Imi canola.
   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. Harmony GT provides EXCELLENT control of wild buckwheat. Data from studies printed in the NDSU Weed Control Research books were summarized for wild buckwheat control from thifensulfuron (Harmony 75DF). Across several different environments and rates ranging from 0.12 to 0.5 oz ai/A (labeled rates in wheat are 0.225 to 0.45 oz ai/A) produced an average wild buckwheat rating of 92% control.

Everest (Bayer) - 70DF - REGISTERED PENDING
    Mode of action: ALS Inhibitor
    a.i.:
flucarbozone
   Crops: Wheat, including durum and winter.
   Comments: Sulfonylaminocarbonyltriazolinone chemstry found by looking for fungicides. In development in HRS wheat and durum - NOT BARLEY - for control of grass and broadleaf weeds at 0.27 lb ai/A (20-30 g ai/ha) to wheat at 1 to 6-leaves. Must use NIS and combine with another broadleaf herbicide. Controls green foxtail, wild oat, mustard species, redroot pigweed, and annual smartweed. Suppresses
yellow foxtail. Bayer has 3 other experimental compounds each other modes of action.

Olympus (Bayer) - 70DF - REGISTERED PENDING
    Mode of action: ALS Inhibitor
    a.i.:
propoxycarbozone
   Crops: Wheat, including durum and winter.
   Comments: Sulfonylaminocarbonyltriazolinone chemstry found by looking for fungicides. In development in HRS wheat and durum - NOT BARLEY - for control of annual bromes and cheat grass.

Puma (Aventis)
    Mode of action
:ACCase inhibitor
   a.i.: fenoxaprop-P + safener
   Crops: Wheat and barley
   Comments: Label application window for wheat is 2-leaf until 60 days prior to harvest. Application window for barley is 2-leaf to 6-leaf stage.

Stampede (Rohm & Haas)
    Mode of action: Photosystem II inhibitor
    a.i.:
propanil
   Crops: Wheat and oat
   Comments: 2(ee) labeling allows addition of reduced rate of Bronate and Buctril (1/4 pt/A) as a tankmix to the normal tankmix products of MCPA ester and petroleum oil for improved control of kochia, Russian thistle, and annual smartweed. Cost is approximately $8.65/A.

Starane (Dow/UAP)
    Mode of action
: Plant growth regulator
   a.i.: fluroxypyr
   Crops: 2(ee) label allows use at reduced rate (0.5 pt/A) in small grains. Can be tank-mixed with most other grass and broadleaf weeds. Registration on pasture/rangeland expected in 2001. Provides excellent common mallow control.

Starane + Salvo and Starane + Sword (Dow/UAP)
    a.i.:
fluroxypyr + 2,4-D and fluroxypyr + MCPA
   Crops: 2(ee) label allows use at reduced rates. Starane + Salvo at 1 pt/A and Starane + Sword at 1.12 pt/A in small grains.

Starane + Esteron, Starane + MCPA, and Starane +Saber (Dow/UAP)
    a.i.:
fluroxypyr + 2,4-D and fluroxypyr + MCPA
   Crops: 2(ee) label allows use at reduced rates. Starane + Esteron at 1 pt/A and Starane + MCPA at 1.12 pt/A and Starane + Saber at 1.5 pt/A in small grains. Starane +Esteron and Starane + MCPA will also be marketed by Agriliance.

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


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