Taking an environmentally sensitive approach to pest management


Integrated Pest & Crop Management



AUTHOR

Kevin Bradley
University of Missouri
Division of Plant Sciences
(573) 882-4039
bradleyke@missouri.edu

Missouri New Herbicide/Label Update for 2011

Kevin Bradley
University of Missouri
(573) 882-4039
bradleyke@missouri.edu

Published: December 7, 2010

I. Corn

Capreno is a new premix from Bayer CropSciences that contains Laudis (tembotrione) plus thiencarbazone, a new ALS-inhibiting herbicide. Capreno is labeled for postemergence use through the V5 stage of corn at 3 ounces per acre and should provide brad-spectrum control of a variety of common summer annual grass and broadleaf weeds.

Prequel is a new premix from DuPont that contains rimsulfuron (Resolve) plus isoxaflutole (Balance Pro). Prequel is formulated as a 45%WDG and can be applied at 1.66 to 2.5 ounces of product per acre prior to corn emergence. The 1.66 ounce per acre rate will provide 1 ounce of Resolve per acre plus 2/3 ounce of Balance Pro per acre while the 2.5 ounce rate will provide 1.5 ounce of Resolve per acre plus 1 ounce of Balance Pro per acre. Prequel can be applied up to 30 days prior to planting and has burndown activity on a variety of winter annual and early-emerging summer annual weeds that might be typically present at the time of application in the early spring. Prequel also provides residual control of a variety of summer annual grass and broadleaf weeds.

TripleFLEX is a premix from Monsanto that contains acetochlor (Harness, others) plus clopyralid (in Hornet) plus flumetsulam (in Hornet). These active ingredients are present in the same ratio as in a similar product called SureStart from Dow AgroSciences. TripleFLEX can be applied at standard rates ranging from 1.5 to 2 pints per acre depending on soil type and organic matter content. There is also a supplemental label which allows a maximum rate of 3 pints per acre.

Verdict is a new name for Integrity, which was a premix from BASF introduced last season. Verdict contains Sharpen (saflufenacil) and Outlook (dimethenamid-P) in the same ratios as in Integrity. Verdict is labeled for preemergence use in field corn, silage, and popcorn at 10 to 16 ounces per acre depending on soil type. Verdict is also labeled for use in grain sorghum and unlike Integrity, Verdict will also be labeled for preemergence use in soybean at 5 ounces per acre, which will provide 1 ounce of Sharpen plus 4 ounces of Outlook per acre. Verdict cannot be applied postemergence to corn, grain sorghum, or soybean, or severe crop injury will result.

Warrant is a new encapsulated acetochlor from Monsanto that is labeled for over-the-top use in soybeans and cotton, but has also received a supplemental label for use in field corn. Warrant can be applied in corn from emergence up until corn reaches 30-inches in height, but should be applied before weeds emerge. Warrant has no post-emergence activity on weeds that are emerged at the time of application; therefore this product will have to be tank-mixed with other products that have activity on weeds that are present at the time ofapplication.

II. Soybean

Authority XL is a new premix from FMC that contains Authority (sulfentrazone) plus chlorimuron (Classic). Authority XL is packaged as a 70DF formulation and islabeled at foundation rates of 3.2 to 4.5 ounces per acre for use in Roundup Ready or LibertyLink soybeans. The full use rates of Authority XL range from 5 to as much as 9.6 ounces per acre depending on soil texture and organic matter content. Authority XL offers both burndown and residual activity on a number of our common broadleaf weed species in Missouri.

Fierce is a new premix from Valent that contains Valor (flumioxazin) plus pyroxasulfone. Fierce is formulated as a 76% WDG and is labeled at rates ranging from 3 to 4.5 ounces per acre depending on soil type. The 3 ounce per acre rate provides approximately 2 ounces of Valor plus 1.5 ounces of pyroxasulfone. Pyroxasulfone is a herbicide that has been under development for many years from Kumiai Chemical. Many may have seen this product before in field trials under the code name KIH-485. Pyroxasulfone is avery long chain fatty acid inhibitor, similar to products like S-metolachlor (Dual II Magnum, others) and acetochlor (Harness, others). In field research trials that we have been conducting for a number of years, we have consistently seen an advantage of pyroxasulfone over other similar herbicides like S-metolachlor and acetochlor, particularly on largerseeded broadleaf weeds like common ragweed and velvetleaf. However, our evaluations of pyroxasulfone usually occurred with 4 ounces of product per acre, not the 1 ounce per acre rate contained in Fierce. Our initial evaluations and comparisons of Fierce as a preemergence soybean herbicide last year showed that this product provides good control of a variety of small-seeded and some large-seeded broadleaf weeds, and also provides some control of common summer annual grass weeds as well.

LibertyLink Soybeans from Bayer CropSciences will have several new changes in the use pattern and rates of Ignite (glufosinate) that are allowed in-crop. The new seasonal maximum amount of Ignite will be increased from 44 to 65 fluid ounces product per acre, which allows users to apply 22 to 36 fluid ounces of product per acre in the first pass, and 22 to 29 fluid ounces of product per acre in the second pass.

Verdict is a new name for Integrity, which was a premix from BASF introduced last season. Verdict contains Sharpen (saflufenacil) and Outlook (dimethenamid-P) in the same ratios as Integrity. Unlike Integrity, Verdict will also be labeled for preemergence use in soybean at 5 ounces per acre, which will provide 1 oz Sharpen plus 4 ounces of Outlook per acre.

Warrant is an encapsulated acetochlor from Monsanto that is labeled for over-the-top use in soybeans from emergence up to the R2 stage of soybeans, although this product has its best fit when applied to soybeans in the V2-V3 stage of growth. The standard application rate of Warrant is 3 pints per acre. Warrant has no post-emergence activity on weeds that are emerged at the time of application; therefore this product will have to be tank-mixed with other products like glyphosate in Roundup Ready soybeans in order to control weeds that are present at the time of application. Warrant will provide pre-emergence control of some grasses and a variety of small-seeded broadleaf weeds like waterhemp that typically germinate later in the season.

For more information on all of these products, visit our website http://weedscience.missouri.edu/ and click on the "Research Results" tab.

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REVISED: July 5, 2012