Section 18 Emergency Exemptions for Brake to control glyphosate-resistant Palmer amaranth are currently expired for 2014. Section 18 requests and authorizations for use in select counties/states are pending for 2015.
Check back often for updates and other formulation-specific information.
Brake® (active ingredient fluridone) introduced a new mode of action for the management of glyphosate-resistant Palmer amaranth (pigweed) in cotton. Since 2011, SePRO has been working in cooperation with many Universities, Cotton Inc. and cotton growers to develop Brake specifically for glyphosate resistant Palmer amaranth control. EPA authorized section 18 emergency exemptions for the control of glyphosate resistant Palmer amaranth in 2012 for Brake (AR and SC), and in 2013 (SC) and 2014 (GA, NC, SC, and TN) for Brake F2.
Grower input has advanced the formulation development
Through the work done with farmers during the last three years under Section 18 authorizations, with support from research and development efforts, continuous improvements in the use of Brake have been made each year. In 2013 and 2014, fluridone was combined with fomesafen (Brake F2) to improve the versatility of the product and as a resistance management strategy combining 2 herbicide modes of action. Efforts continue to optimize the Brake formulation based on the regional differences in weed control systems and preferences to maximize the pre-emergence performance, crop safety, and versatility in the different regions.
Research with this new mode of action in Brake over the last 3 years has shown the following:
- Excellent Palmer amaranth control
- Good residual activity
- Excellent crop safety
- Staying power under wet conditions
- Versatile base residual herbicide for integrated weed management program
The Brake Herbicide Four-Step Integrated System that is being developed: Start Clean. Stay Clean.
- Pre-plant burn down/cultivate
- Apply Brake® Herbicide at-planting or within 24 to 36 hours of planting
- Early post with a residual within 12 to 16 days of your planting.
- Scout and utilize late post + residual and/or layby (as needed)
Glyphosate resistant Palmer amaranth control is improved through the use of a comprehensive weed control program. When using pre-emergent herbicides, Palmer amaranth may escape control prior to activation by mositure. Thus, a postemergent application 12 to 16 days after planting, that includes a non-selective post-herbicide, in combination with a residual herbicide (e.g. Warrant® or Dual Magnum®), IS REQUIRED to control early Palmer amaranth escapes and to overlap residual herbicides. The purpose of overlapping residual herbicides during postemergent applications is to eliminate all weed escapes for a zero-tolerance approach. Aggressive scouting is needed for Palmer amaranth and, when necessary, secondary postemergent applications including a residual herbicide are necessary. Depending on the frequency of Palmer amaranth escapes, standard post-directed or layby herbicide applications are also recommended, when necessary, in addition to other cultural practices. Only use herbicides that are compatible with the cotton variety being grown. If uncertain, contact a local extension agent or crop consultant to verify herbicide tolerance for different cotton varieties.
Roundup Ready (glyphosate tolerant) Cotton Varieties
When planting varieties of cotton that are tolerant to Roundup® (glyphosate), any escape of glyphosate-resistant Palmer amaranth will not be controlled with a postemergent application of glyphosate. Thus, the use of overlapping residual herbicides is required to maintain adequate control of glyphosate resistant Palmer amaranth in such systems and to minimize the potential for Palmer amaranth seeds to germinate and become established. For best results, follow a comprehensive weed management program with timely applications of overlapping residual herbicides.
The spread of glyphosate-resistant Palmer amaranth has put extreme pressure on weed control systems and brought a renewed interest in the development of alternate herbicides for cotton. Since 2011, SePRO Corporation has worked in conjunction with the USDA and Cotton Incorporated to conduct research with Clemson University, the University of Georgia, North Carolina State University, the University of Tennessee, Mississippi State University, the University of Florida, the University of Arkansas and others as part of a Cooperative Research Program. The Brake herbicide system is being developed as part of a sustainable herbicide strategy for cotton featuring a new mode of action with resistance management as a primary goal.
Please visit the Herbicide Resistance Action Committee web site for more information.
Please check back for a list of authorized distributors.