ISSUE 2 May 20, 2010
EPA REGISTRATION OF FIRSTSTEP
The is probably late since most all small grains have been seeded but it is a new herbicide registration. FirstStep herbicide from Dow AgroSciences has received federal registration and is now available for the 2010 spring season. FirstStep uses two active ingredients and modes of action (florasulam and Durango DMA glyphosate) to control weeds in cereal crops, including wild buckwheat, tansymustard, wild mustard, sheperdspurse, pennycress, chickweed, flixweed, bedstraw, seedling dandelion, and volunteer Roundup Ready canola, and several other grasses and broadleaf weeds.
The herbicide can provide up to three weeks of residual weed control from the florasulam. FirstStep is registered for use in spring wheat (including durum), barley and oats from 10 days prior to 2 days after seeding. The product is currently offered in a co-pack designed to treat 40 acres.
REVISION TO LAUDIS CROP ROTATION
The Crop Rotation Restrictions on page 108-109 of the 2010 Weed Guide does not reflect the label changes that were made for Laudis. Unfortunately this has caused confusion as growers see one thing in the weed guide but hear differently from the Bayer sales reps.
Please change the Crop Rotation Restriction chart on page 108 and 110 of the 2010 ND Weed Control Guide to the following:
Laudis = 10 month after application (MAA) for dry beans and sugarbeet.
New footnote added on page 110 = (g) Cumulative precipitation between application and planting of dry beans and sugarbeet is 20 inches. 10 MAA rotation interval applies to all dry bean types except red kidney and cranberry (18 MAA). Thorough tillage must precede planting of sugarbeet.
Also, on page 108 change Valor/Chateau to indicate the following - See page 6 (not 12).
These changes have been made on the web version of the weed guide: www.ndsu.edu/weeds.
SPARTAN CHARGE REGISTERED ON DRY EDIBLE BEANS
The NDDOA has issued a special local needs (SLN) registration to FMC Corp., enabling North Dakota dry bean producers to use the herbicide Spartan Charge to control kochia, eastern black nightshade and other problem weeds. Spartan Charge is effective on most small-seeded broadleaf weeds. The SLN registration supplemental labeling allows early pre-plant or pre-emergence application of Spartan Charge to dry bean fields by ground or aerial equipment. Use rates are from 3.75 to 5.75 fl oz/A depending on soil texture and percent organic matter. The product may not be used on coarse soils classified as sand with less than 1.5 percent organic matter and a soil pH greater than 7.0. Users must follow all precautionary statements from the Section 3 label and the supplemental SLN labeling and must have the SLN labeling in their possession during application. This registration is effective immediately and expires on Jan. 1, 2015.
It is emphasized that a grower indemnification is required prior to use. Spartan was labeled on dry beans for one year in 1996 then the label was cancelled because of injury claims from growers in states other than ND. Because our higher organic matter and medium and fine textured soils safens Spartan on dry beans, several people from ND and MN have encouraged FMC to continue the label in our two states. Sam Lockhart, the FMC tech rep, also "pleaded our cause" - which our efforts were successful in this label renewal. Growers use this product at their own risk but the risk of injury in the dry bean growing areas of ND and MN are very low. The high organic matter (2-5%) and clay content in our ND and MN soils act as a buffer to negate any risk of any injury to dry bean as compared to lighter and low organic matter soils in NE, CO and other areas. If growers follow the use rates and soil restrictions on the label there should be no risk of any injury.
NDSU Extension Weed Specialist
THAT PESKY DANDELION
Dandelion is a simple perennial meaning it survives for greater than two years with a specialized tap root. The two mechanisms of spread of dandelion include wind-dispersal of seeds (a few hundred feet) and regrowth of root segments spread after tillage. Only mold-board plowing followed by two tillage passes will maximize dandelion control. Minimum and no-tillage allows dandelions to increase over time if not controlled with herbicides. A single tillage pass in the spring prior to planting will only kill a small percentage of plants. The larger and more established a dandelion plant becomes, the more difficult it is for tillage to control such plants.
The greatest majority of dandelion seed production occurs in the spring, although dandelion can flower throughout the growing season. In late summer, dandelion will flower again and those seeds can produce new plants that likely will survive the winter.
To control dandelion seed production must be stopped and established plants controlled. Consider controlling dandelions around field perimeters to reduce reestablishment by air-borne seeds or use herbicides in the crop field having residual activity to control the incoming seeds. As plants become older and larger, they are more difficult to control with herbicides as well.
Refer to last week’s article for herbicide recommendations to control dandelion and consult the following web page: http://www.ag.ndsu.edu/weeds/weed-year/Dandelion.pdf
Agronomist - Weed Science
Extension Weed Specialist
WEED CONTROL IN ROUNDUP READY SUGARBEET
The first glyphosate application of the season in Roundup Ready sugarbeet should be applied when sugarbeet are in the two-leaf and no greater than the four-leaf stage of development or when the spring cover crop has reached the three-leaf stage of development. If weeds are dense, greater than one to two inches in height, and/or known to be difficult to control with glyphosate, apply glyphosate at 1.125 pounds acid equivalent per acre (lb ae/A). This equates to 32 fluid ounces per acre (fl oz/A) of Roundup branded formulation or 48 fl oz/A of a 3.0 lb ae/gal formulation. For proper glyphosate rates based upon acid equivalent rates, consult page 30 of the 2010 Sugarbeet Production Guide, page 71 of the 2010 North Dakota Weed Control Guide, or Glyphosate Formulation for RR Sugarbeet in 2010 at the following web address:
If weeds are small (<1") and pressure is light, but a glyphosate application is warranted to control the spring cover crop, apply glyphosate at 0.98 lb ae/A as a broadcast application.
If lambsquarters is present in a field include a good quality nonionic surfactant (NIS) with glyphosate at 0.25 to 1.0 %v/v. For glyphosate formulations fully-loaded with NIS add 0.25 %v/v, unless the label prohibits its addition. For glyphosate formulations partially-loaded with NIS add 0.25 to 0.5 %v/v, unless the label prohibits its addition. For glyphosate formulations containing no NIS add 0.5 to 1.0% v/v.
If wild buckwheat, common or giant ragweed, and/or volunteer Roundup Ready soybeans are present in a field add Stinger to glyphosate at 2 to 4 fl oz/A. The higher rate may be necessary to maximize control of wild buckwheat and giant ragweed. If dandelion is present apply glyphosate at 1.125 lb ae/A. Apply glyphosate every 21 days after the previous application as necessary to maximize dandelion control. The addition of Stinger to glyphosate in the first application will likely improve dandelion control, but no research is available in Roundup Ready sugarbeet to know what rate should be applied to reduce crop injury and maximize control.
Agronomist - Weed Science