ISSUE 5 JUNE 3, 1999
SLN LABEL ISSUED FOR CHICKPEAS
Commissioner of Agriculture Roger Johnson has issued a special local
(SLN) for Tough SEC, allowing North Dakota garbanzobean producers to use the herbicide
to kill post_emergent weeds. The label was issued because only preemergence herbicides are
currently approved for garbanzo beans. North Dakota is among the leading producers of garbanzo
beans, also known as chickpeas. Applicators must follow all instructions, warnings and precautions
on the Section 3 and SLN labels. The SLN label must be directly attached to theproduct container
and be in the user's possession during application. Tough SEC is manufactured by Novartis Crop
One or two applications of 24 fl oz/A may be made per crop with a
minimum of 20 days between
applications. Adjuvants are prohibited from use with Tough. For best control of broadleaf weeds,
applications should be targeted to actively growing weeds by the fourth stage (3 inches in height).
1999 SMALL GRAIN HERBICIDE UPDATE
Achieve 40DF (Zeneca)
Mode of action: ACCase Inhibitor
Crops: HRS and durum wheat, and barley.
Comments: Federal Section 3 registration granted. 40WDG formulation may change in the future
to a different concentration. Wide crop stage application window: 2-lf to boot.
SuperCharge (U.S.) / Turbo-Charge (Canada) oil adjuvant is included in a separate
container in the box and should be used at least at 0.5% v/v. It has MSO type oil +
buffer (phosphate esters) to alter (lower) water pH. ADDITION OF AMS AT 7 TO
15 LB/100 GALLONS WATER IS REQUIRED. Wild oat are more susceptible than
foxtail. Also controls ryegrass and barnyardgrass. Dry weather before and after
application decreases grass control. Severe antagonism when tankmixed with SU's and
phenoxy amines. May tankmix with Buctril, Bronate, Stinger, and/or MCPA ester.
Synergistic activity with Bronate. Supplemental label expands tank mix options to Starane
and Harmony GT (not in ND). Resistant wild oat populations have been documented
in Canada. Wild oat control is reduced when Achieve is applied in intense UV light,
during midday as opposed to evening, and at low GPA. Reducing water carrier pH to
below 6 increases wild oat and grass control with dim (Achieve, Poast, Select) herbicides
due to greater absorption of neutral charged molecules than in the anionic form at higher pH.
Greater absorption may also increase when adding ammonium fertilizer which changes
molecules to NH3 form. Solution should be sprayed soon after mixing because of acid
hydrolysis degradation in low pH conditions.
Aim 40DF (FMC)
Mode of action: PPO Inhibitor
Crops: Wheat and durum.
Comments: $4/A at 0.33 oz/A. Contact, nonresidual, broadleaf herbicide. Narrow weed spectrum
kochia (+ALS resistant) and pigweed. Always apply with other broadleaf herbicides,
such as phenoxy herbicides or bromoxynil. Crop leaf burn may occur with oil adjuvants
and hot weather. DO NOT apply to barley.
Mode of action: Plant growth regulator
Crops: Corn and wheat.
a.i.: Banvel = dicamba - dimethylamine salt
Clarity = dicamba - diglycolamine salt
Comments: Aerial applications of Clarity allowed on most all registrations. Clarity label may expand
window of application in corn. BASF allow Microflo the right to market Banvel in registered
crops. BASF will retain Clarity for all Banvel markets. Heavier salt formulation of Clarity
reduces risk of drift compared to Banvel or SGF but droplet or particle drift is equal among
formulations and caution should be used using any dicamba brand.
|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|
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 2000. Controls grass weeds -
excellent on wild oat at reduced rates. Wild oat is more susceptible than foxtail.
Controls barnyardgrass. Less antagonism with broadleaf herbicides than fenoxaprop
or Achieve. Do not use on barley.
Harmony GT (DuPont) 75DF
Mode of action: ALS inhibitor
Crops: Small grains, and possibly Imi canola
Comments: Only available in Pacific NW in 1999. Formulated as the original Harmony 75DF
instead of 25DF. Pinnacle will be phased out. GT stands for Grass Tankmix because
of its limited antagonism with POST grass herbicides. Tankmixes include Achieve,
Assert, Avenge, Dakota, Hoelon, and Tiller. EPA has been petitioned to allow use
on Imi canola.
Imi wheat - Wheat resistant to Raptor is in development and varieties and use
expected in 2003.
Control most annual grass and broadleaf weeeds.
Maverik (MON 37500) 75DF (Monsanto)
Mode of action: ALS inhibitor
Crops: Spring and winter wheat
Comments: Registration expected in 2000. A very long residual, SU herbicide applied PRE or
POST at 0.67 oz/A for cheatgrass/downy brome, quackgrass and broadleaf weed
control in winter wheat. Better efficacy with early postemergence applications.
Has foxtail and wild oat activity. Poor control of jointed goatgrass. MSO adjuvants
provide greater herbicide enhancement.
Paramount (BAS 589) (BASF) - In USA
MKH 6562 (Bayer) - 70DF
Mode of action: ALS Inhibitor
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. Other experimental compounds with different modes of action are in development.
Puma at 0.67 pt/A for wild oat and barnyardgrass =
Buctril or Bronate at 1 pt/A or MCPA ester at 0.75 pt/A, or Curtail M at 1.75 pt/A, or Stinger at
0.25 to 0.33 pt/A, or Harmony GT at ½ oz/A, or Harmony Extra at 3/10 oz/A, or Peak at 0.5 oz/A,
or Ally at 1/10 oz/A, or Starane at 0.66 pt/A, or Tordon at 1 to 1.5 fl oz/A.
Rave (Novartis) 58.8% DF
Mode of action: ALS inhibitor + Plant growth regulator
a.i.: 5:1 ratio of triasulfuron (Amber) + dicamba (Banvel/Clarity)
Crops: Wheat, pasture, rangeland, and CRP
Comments: 2 to 4 oz/A. Registered in ND but not actively promoted in wheat in ND due to
the very, very, very long carryover of Amber and rotation restriction rotation to
sensitive crops broadleaf crops.
Some evidence that some kochia populations may exhibit varying degrees of natural tolerance to Starane.
NDSU Extension Weed Specialist
Cool, wet weather can jeopardize the effectiveness of herbicides
used in corn and can sometimes
contribute to crop injury. Wet weather can lessen the effectiveness of the herbicides used by washing
chemicals from the weeds or by leaching the chemicals through porous soil profiles away from weed
roots. Even worse, the weather can slow crop metabolism of the applied herbicides. With cool, wet
weather, some pre-emerge and early post herbicides are slowed when being metabolizing through
crop plants. Slow crop plant growth usually translates to even slower metabolism of herbicides
through crop plants.
Ohio State has already reported corn leafing-out underground rather
than emerging properly in
areas which are experiencing cool, wet weather. Two herbicides used in these areas are Lasso and
Dual. If soil is not crusted severely, the corn often still emerges and continues to grow without yield
loss. However if the soil surface is crusted, corn can have a difficult time breaking through the soil
surface barrier with already emerged leaves. In areas where soil moisture has remained, the corn
should be able to come through the surface and will also be helped by a quicker degradation of the
alacholor or metolachlor with the excess soil moisture and warming temperatures. Watch crops
carefully, excess moisture also stresses the young corn seedlings which in turn accentuates the slow
metabolism problems and can allow the corn to become more susceptible to cool, wet season
diseases lurking in the soil and on remaining crop residue.
Another metabolism problem that has been seen this year is with
Balance on corn. Corn generally
has a good tolerance to Balance because corn can rapidly metabolize the active ingredient, isoxaflutole,
to nonphytotoxic forms within the crop plant. However some farmers in Illinois have reported a
"bleaching" symptomology along the margins and tips of new corn leaves in areas experiencing cool
weather and very wet soils. This weather has been slowing overall crop growth and thus slowing the
plant's ability to rapidly metabolize the herbicide. When the amount of the active herbicide within the
plant exceeds the plant's ability to metabolize the chemical, crop injury symptoms have resulted. Most
injury has been more distinctive along headland rows where there probably was a double-up of the
application. Also, soils lower in organic matter and also those with a higher sand content may have
more herbicide in solution and thus more available for plant uptake. Recent field scouting has suggested
that injury from use of Balance which has been present for a week or longer has been showing signs
of recovery with warming weather.
During cool, wet seasons, it is imperative that crop scouting be
done regularly--weekly, if possible.
Crop plants slowed in growth due to weather conditions are more susceptible to stresses from
herbicides, insects, diseases as well as weed competition. Carefully evaluate crop concerns seen
in the field in order to accurately diagnose the problems.
Denise A. McWilliams
Extension Crop Production Specialist