ISSUE 2    May 12, 2005

BLANKET (SULFENTRAZONE) REGISTRATION IN ND

The ND Department of Ag received and granted a pesticide registration application for Blanket, the sulfentrazone product manufactured by Tenkoz that is labeled for use on soybean in many states. This herbicide is now a registered pesticide in North Dakota.

As part of the registration, Tenkoz supplied supplemental labeling allowing use of the product on sunflower, dry field pea, and chickpea. The full product label allows use only on soybean.

The supplemental labeling is available for download from the Departmentís online pesticide registration database:

http://www.kellysolutions.com/nd/pesticideindex.htm

and the NDSU Pesticide Programs page:

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

Support should be given to Tenkoz and FMC for their willingness and hard work to gain these uses of Blanket to address the Spartan supply shortfalls.

In summary:

Spartan DF = Use on any crop listed on the label. May be used for a 15 day period on flax.

Spartan 4L = Use on soybean, sunflower, field pea, and chickpea. May be used for a 15 day period on flax. Do not use on dry beans or potato.

Authority = Use on soybean, sunflower, field pea, and chickpea. Do not use on dry beans or potato.

Blanket = Registered in ND. Federal registration allows use on soybean. Uses for snfl, field pea, and chickpea is registered through supplemental labels and can be found at the NDOA web site and the NDSU Pesticide Programs page.

 

PURSUIT PLUS LABELED ON DRY BEANS AND SOME PULSE CROPS

BASF has issued Supplemental labeling for Pursuit Plus on dry beans, field pea, chickpea, and lentils. The dry bean supplemental label is available on the BASF web site or CDMS. I would anticipate the pea label will be posted shortly.

Note for dry beans:
Can be used for all dry beans grown in ND EXCEPT pinto.
Rate = 1.25 pt/A - may apply an additional 0.75 to 1 pt of Prowl 3.3EC. Apply PPI within 1 week before planting.

Note for pea:
Rate = 1.25 pt/A - may apply an additional 0.75 to 1 pt of Prowl 3.3EC. Apply PPI within 1 week before planting.

 

CORN (PRE) HERBICIDE UPDATE

Basis (DuPont)
Mode of action
: ALS inhibitor
a.i.: thifensulfuron
Crops: Corn
Rate: 1/3 oz DF/A - recommended use rate.
Comments: 2(ee) label allows use as a preemergence application in ND, SD, and MN. Apply alone or in tank-mix with other registered herbicides for burndown control of emerged weeds and early season residual control in corn. Apply only to corn hybrids of greater than 77 days RM.

Callisto (Syngenta)
Mode of action
: 27 (page 109 ND wed guide)
a.i.: mesotrione
Crops: SWEET corn
Rate: Pre = 6 to 7.7 fl oz/A, POST = 3 fl oz/A
Comments: Controls many broadleaf weeds including lambsquarters, pigweed, nightshade, others. Risk of injury to some sweet corn varieties may occur. Pre applications less likely to injury sweet corn than POST applications. May be applied with other products labeled for use on sweet corn. NIS adjuvant are preferred over oil adjuvants to reduce risk of temporary bleaching. Nitrogen, in any form, is NOT allowed to reduce risk of bleaching. As a result weed control may be reduced. Target smaller weeds to compensate. Atrazine at 0.42 oz DF/A will increase weed control and will not leave a phytotoxic residue the next year.

Radius 4SC (Bayer)
Mode of action
: 15 and 27 (page 109 ND weed guide)
a.i.: Define (flufenacet) + Balance Pro (isoxaflutole)
Crops: Corn
Rate: 14 to 28 fl oz/A depending on soil texture and OM content - 14 fl oz rate contains 1.5 fl oz Balance Pro
Comments: Apply EPP, PPI, or PRE. Similar to Epic but contains a lower ratio of Balance Pro. Requires moisture for activation. Refer to follow crop rotations on label before using Radius. Only potato and soybean can be planted 6 months after application. All other crops require an interval of 12 to 18 months before planting. Refer to label at greenbook: (The label is not listed at cdms)

http://www.greenbook.net

Richard Zollinger
NDSU Extension Weed Specialist
r.zollinger@ndsu.edu

 

CONTROL OF WEEDS EMERGING BEFORE SEEDING OR BEFORE CROP EMERGENCE.

Germination and emergence have been earlier than normal for many weed species in North Dakota in the spring of 2005. This early emergence provides an opportunity to improve to overall weed control in crops by controlling the weeds with tillage or herbicides prior to crop seeding or emergence.

Tillage can be used to control weeds prior to seeding but:

  • tillage may transplant or miss some weeds,
  • tillage will reduce surface residue and increase the risk of soil erosion,
  • tillage is costly with present high fuel prices,
  • spring tillage for weed control does not fit with no-till or reduced tillage production systems, and,
  • tillage will destroy an established cover crop.
  • Glyphosate products such as Roundup have no phytotoxic soil residual and can substitute for tillage used for weed control. Glyphosate also can control weeds missed by tillage. On non-Roundup Ready crops, glyphosate must be applied after weed emergence and before crop emergence. Possible disadvantages of glyphosate are:

  • glyphosate sometimes provides less than total control of small kochia and wild buckwheat and
  • glyphosate will kill emerged living cover crop.
  • The cover crop may not be large enough to protect from wind when the glyphosate is applied preemergence.

    Aim EW has no phytotoxic soil residual and is registered to control emerged weeds prior to seeding or emergence of about 600 crops including small grain, corn, soybean, sugarbeet, potato and canola. Research at North Dakota State University has shown that Aim EW tank-mixed with glyphosate at 0.51 fl oz/A often will provide improved and more rapid control of newly emerged weeds such as kochia, wild buckwheat, and common lambsquarters compared to glyphosate alone. The Aim EW rate should be increased to 0.8 fl oz/A when weeds are 1 to 2 inches tall at application.

    Aim EW should be added to the spray tank first, glyphosate second and the surfactant third. Weeds should be actively growing and a nonionic surfactant at 0.25% v/v should be included for optimum weed control.

    Aim also can be used alone prior to seeding or emergence of crops. Aim used alone should be considered to control broadleaf weeds without injuring a grass cover crop. Aim used alone will allow the grass cover crop to continue to grow and protect from wind erosion and crop injury from wind. A postemergence herbicide for grass control would be used to kill the grass cover crop after the broadleaf crop has emerged.

    Alan Dexter
    NDSU/U of MN Extension
    Sugarbeet Weed Specialist
    adexter@ndsuext.nodak.edu


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