New herbicide options in corn and soybean for 2007

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.      

Since the release of the 2007 Weed Control Guide for Field Crops, several new herbicides have been registered for the 2007 growing season in corn and soybean.  Following is information on some of the new products you will hear about this season.  New registrations or label changes that occurred prior to publishing the Weed Control Guide can be found in the previous article, Updates from 2007 Weed Control Guide for Field Crop.

Corn herbicides

Breakfree, Breakfree ATZ and Breakfree ATZ Lite are a group of preemergence/early postemergence herbicides that are similar to Surpass, Keystone and Keystone LA.  The use rates and restrictions for the Breakfree family of products will vary for soil conditions and this information can be found on their label. 

is a new formulation of Distinct (dicamba + diflufenzopyr) that includes a crop safener for postemergence control of broadleaves.  This safener increases the metabolism of the herbicide inside the corn plant resulting in a decrease in the potential for injury due to an extreme wind event.  The recommended use rate for Status alone is 5 oz/A or 2.5 oz/A if tank mixed another herbicide like glyphosate.  The preferred adjuvant for Status is crop oil concentrate, however if tank mixed with an adjuvant-loaded glyphosate, no adjuvant is needed.  Status can also be tank mixed with herbicides that require non-ionic surfactant or methylated seed oil adjuvants. 

Soybean herbicides

Although Canopy EX (29.5 DG) is not a new herbicide to the soybean market, recent label changes will allow for it to be used differently that it has in the past.  Canopy EX is a premixture of Classic (chlorimuron) plus Express (tribenuron) that has been typically used in the fall or early spring (45 d prior to planting) for control of winter annual weeds and residual control of certain summer annual weeds.  Canopy EX can now be applied within 7 d of planting soybean if the use rate is 2.2 oz/A or less and can be applied within 14 d of planting with use rates of 2.2 to 3.3 oz/A.  As with all chlorimuron products use rates and rotational restrictions are dependent on soil pH.

Valor XLT 40.3DG
is a new premixture being marketed by Valent Agricultural Products. Valor XLT contains Valor (flumioxazin) and Classic (chlorimuron) and can be applied in the fall, early preplant, preplant, or preemergence.  The typical use rate of Valor XLT is 3 oz/A (1.76 oz/A of Valor and 1.24 oz/A of Classic), unless the soil pH is greater than 6.8.  If the soil is pH ranges from 6.9 to 7.6, Valor XLT should only be applied at 2.25 oz/A or less.  DO NOT use Valor XLT if soil pH is greater than 7.6.  Valor XLT will provide control of some winter annual weeds and provides residual control of common lambsquarters, common ragweed, eastern black nightshade, pigweeds, smartweed, velvetleaf, wild mustard and horseweed (marestail).  Valor XLT should not be applied to emerged soybeans and should not be tank-mixed with chloroacetamide containing products like: s-metolachlor (Dual Magnum), dimethenamid-P (Outlook), alachlor (Intrro), or flufenacet (Define) or severe soybean injury can occur.  Rotational restrictions and precautions for Valor XLT are similar to restrictions for Valor and other chlorimuron containing products.

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