ISSUE 3 May 21, 1998
HERBICIDE - INSECTICIDE COMBINATIONS
Emulsifiable concentrate formulations of insecticides can act like
oil adjuvants when applied in combination with a herbicide. Past research has demonstrated
that Asana or Lorsban in combination with Betanex or Betamix can cause more sugar beet
injury than Betanex or Betamix alone. Asana and Lorsban should not be applied in
combination with normal rates of Betanex, Betamix or Betamix Progress in situations where
sugarbeet injury is a concern. The micro rate of Betanex or Betamix + UpBeet + Stinger +
methylated seed oil at 0.5 pt/A + 1/8 oz/A + 1.3 fl oz/A + 1.5% v/v already has an oil
adjuvant as a part of the system. Therefore, the addition of Asana or Lorsban to the micro
rate would not be expected to cause an increase in sugarbeet injury.
While Lorsban and Asana act like oil adjuvants, the insecticides are
not as effective as commercial oil adjuvants and the insecticides should not be
substituted for oil adjuvants in herbicide treatments where oil adjuvants are needed for
optimum weed control.
CLEARANCE OF SPECIAL SECTION 18 LABELS
ND/MN Extension Sugarbeet Specialist
1. Stinger has been cleared on canola.
2. Cheyenne has been approved for aerial application through May 26.
3. Puma has been cleared on durum wheat.
4. Puma has been cleared on barley
5. Tiller has been cleared (Section 3) on barley.
6. Starane has been cleared on wheat and barley.
7. Select has been cleared on alfalfa and dry beans (Section 3)
8. Cobra has been cleared for suppression of white mold in soybeans
1998 NEW HERBICIDE REVIEW
Accent Gold 75DF + 83.8 DF (DuPont)
Achieve 40DF (Zeneca)
Mode of action: 3 ALS + 1 PGR
a.i.: (nicosulfuron (Accent) + rimsulfuron (Matrix) +
(clopyralid (Stinger) + flumetsulam
(Python/Broadstrike) = Hornet)
Comments: One rate of 2.9 oz DF/A gives broad-spectrum
grass and broadleaf weed control and suppression of Canada thistle. Restricted to 88
or more day maturity corn varieties. Pioneer released a list of corn varieties susceptible
to injury from DuPont corn herbicides. DO NOT use Accent Gold or Basis Gold on 3941
or severe injury will occur. Accent Gold contains 0.25 oz/A Accent 75DF/A and 0.25
oz/A Matrix 25DF, 4 fl oz/A Stinger, and 0.7 oz/A Python 80DF (2.4 oz/A Hornet). Low rates
of active ingredients decrease carryover potential. Does not control ALS resistant kochia
because Accent, Matrix and Python are ALS herbicides and Stinger provides poor
control. May not control late emerging nightshade.
Cost approximately $20.00/A at 2.9 oz DF/A.
Mode of action: ACCase Inhibitor
a.i.: tralkoxydim (40WDG will be replaced with 80WDG)
Crops: HRS and durum wheat, and barley.
Comments: U.S. registration expected during or after use season in
1998. Crop stage restrictions is 2-lf to boot.. 7 to 9.5 oz 80DF/A for wild oat and
foxtail control = $12 to $16/A. Wild oat are more susceptible than foxtail. Severe
antagonism with SU's and phenoxy amines but may have tankmix options with Buctril,
Stinger, and/or MCPA ester. Addition of AMS may increases weed control. Same mode of
action as fenoxaprop. Turbo-Charge adjuvant included in separate container. In Canada,
premixes of Achieve + Buctril M (Bronate) = Achieve Extra Gold and Achieve + Curtail M =
Prevail are available.
Aim 40DF (FMC)
Mode of action: PPO Inhibitor
Crops: Corn (Registration expected in 1998)
Comments: Contact type herbicide for broadleaf weed control. Narrow
weed spectrum (velvetleaf) so will be available only in premix with other broadleaf
herbicides such as atrazine to increase broadleaf weed control. Controls ALS resistant
Avenge (American Cyanamid)
Mode of action: Diverse - not known
Crops: HRS wheat varieties have been added to label ONLY at 2.5 to
3 pt/A = 2375, AC Domain, AC Barrie, Anza, Bacup, Brooks, Cavalier, Colusa, Ernest, Forge,
Hamer, Hi-Line, Kulm, Lars, McNeal, ND2375, Norlander, Oxen, Rich, Russ, Serra, and
Sharpshooter and Yolo.
Axiom DF (Bayer)
Mode of action: Same as Lasso, Dual, Frontier, etc.
a.i.: fluthiamide + metribuzin (54.4%+13.6% DF or 4:1 ratio)
Comments: Registered in April of 1998. PPI or PRE with 4 to 6
weeks activity. Primarily foxtail control plus a few small seeded-broadleaf weeds (same
weed spectrum as Lasso, Dual, Frontier, Harness, Surpass). Rainfall is REQUIRED for PRE
weed control. Does not appear as active on North Dakota soils as competitive herbicides
due to limited rainfall. Must incorporate for consistent weed control.
Balance (Rhone Poulenc)
Mode of Action: Carotenoid inhibitor
Comments: Registration expected during use season in
1998. Apply only PPI or PRE for wide spectrum grass and broadleaf weed control, including
wild proso millet, woolly cupgrass, sandbur, and kochia. Do not apply to corn POST due to
severe corn injury. New and unique mode of action - carotenoid inhibitor. May provide
better weed control in low rainfall conditions than other PPI or PRE herbicides. Weak on
yellow foxtail, sunflower, giant ragweed and wild buckwheat. Requires rain for maximum
weed control. Will control small emerged weeds after a rain event due to movement to and
absorption through the roots. Provides 6 to 8 weeks residual weed control. Crop rotation
restriction currently at 6 months for all rotational crops. However, 1998 carryover field
trials in ND gives concern to some rotational crops.
Bromoxynil (Rhone Poulenc, Micro Flo through Terra and Ostlund)
Mode of action: Photosynthesis II inhibitor
Several brand names introduced in addition to Buctril and Bronate.
Bromoxynil - Photosynthetic inhibitor - other site
Buctril - Rhone Poulenc
Broclean - MicroFlo through UAP/Ostlund
Moxy - MicroFlo through Riverside/Terra
Bromoxynil + MCPA
Bronate - Rhone Poulenc
Bromac - MicroFlo through UAP/Ostlund
Bison - MicroFlo through Riverside/Terra
Bromoxynil + Atrazine
Buctril + Atrazine - Rhone Poulenc
Brozine - MicroFlo through Ostlund
Moxy AT - MicroFlo through Riverside/Terra
Buctril Gel will be discontinued.
A dry ester formulation (20WP) and a dry granule formulation (80WG) are being tested for
Mode of action: ALS inhibitor + Plant growth regulator
a.i.: Nicosulfuron (Accent) + dicamba (Banvel 70WDG)
Comments: Registered in April of 1998. Use rate is 6.67 of DF/A and
is equivalent to Acccent at 2/3 oz DF/A + Banvel at 8 fl oz. Includes a dry formulation of
dicamba. Label does not recommend but does not prohibit use of oil adjuvant which is
different than restriction on Banvel label. Unfortunately, Celebrity label restricts use
of adjuvants that cause spray solution pH to change (i.e. Quad 7).
Mode of action: Plant growth regulator
a.i.: dicamba - diglycolamine salt
Crops: Use expanded to small grains in addition to corn and other
Comments: Heavier salt formulation reduces risk of drift compared
to Banvel (dicamba - dma salt), or Banvel SGF (dicamba - Na salt).
Caution: The risk of particle drift is the same as other dicamba formulations.
Banvel = dicamba - dimethylamine
Banvel SGF = dicamba - Na+
Clarity = dicamba - diglycolamine
Fallowmaster = dicamba - acid + Roundup
Marksman = dicamba - K+ + atrazine
Resolve = dicamba - Na+ + Pursuit
OpTill = dicamba - acid + Frontier
Mode of action: PGR
a.i.: clopyralid + 2,4-D
Comments: Registered in May of 1998 only in certain states to
help manage sugarbeet rotational issues. Labels allow POST application to corn less than 8
inches tall or 4 visible collars or through directed application to corn between 8 inches
tall/5 collars to 24 inches tall. Strong caution that Curtail contain 2,4-D which may
cause corn stem brittleness/stalk breakage during windy conditions.
Discover (Novartis) - In U.S.
Horizon (Novartis) - In Canada
Mode of action: ACCase inhibitor
Crops: HRS and durum wheat.
Comments: Registered in Canada. U.S. registration expected in 1999
or 2000. Controls grass weeds. Less antagonism with broadleaf herbicides than fenoxaprop
herbicides (Dakota, Cheyenne, Puma, Tiller) or Achieve.
Mode of action: Plant growth regulator + Auxin inhibitor
a.i.: dicamba (Banvel) + diflufenzopyr (2.5:1 ratio).
Comments: Diflufenzopyr is of semicarbozone chemistry and has an
auxin transport inhibitor (ATI) mode of action that synergizes auxin type herbicides
(2,4-D, Banvel, Starane, Stinger, Tordon). Use rate of 4 to 8 oz product/A controls most
annual broadleaf weeds and gives herbistatic grass suppression. Good to excellent corn
safety depending on stage of application. Late applications are more prone to injury.
Diflufenzopyr in combination with dicamba or picloram (Tordon) has given excellent control
of Canada thistle, sowthistle, and leafy spurge control in NDSU field trials. Registration
in corn expected late in 1998.
NDSU Extension Weed Specialist