2 Make TIMELY APPLICATIONS of herbicides • Apply full labeled rates of an Enlist herbicide to actively growing weeds once the majority reach 3 to 6 inches in height. 3 SCOUT WEEDS before and after application • Scout fields before application to ensure herbicides and use rates will be appropriate for the weed spectrum and weed size present. • Scout fields after application to detect weed escapes or shifts in weed spectrum. • Early detection of possible resistant species can limit the spread of these weed populations and allow for the implementation of alternate weed management practices. 4 SEE THE BIG PICTURE, beyond the field and the herbicide • Incorporate nonchemical weed control practices, such as mechanical cultivation, crop rotation, cover crops and weed-free crop seeds, as part of an integrated weed control program. • Manage weeds in and around fields, during and after harvest, to reduce weed seed production. • Thoroughly clean plant residues from equipment before leaving fields suspected to contain resistant weeds. 5 Agronomic and cultural PRACTICES • Rotate crops and cultural practices to allow for a wider range of weed control practices. • Use only commercial, weed-free crop seed.
The Weed Science Society of America (WSSA) classifies 2,4-D as a Group 4 herbicide (synthetic auxin) and glyphosate as a Group 9 herbicide (inhibitor of EPSP synthase). As with some herbicides, some naturally occurring weed biotypes that are resistant to 2,4-D or glyphosate may exist due to genetic variability in a weed population. Steps to help prevent weed resistance Implementing a successful weed resistance management program will help ensure the continued efficacy of the Enlist ® weed control system. These steps are important to the ongoing success of your program.
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Use a herbicide PROGRAM APPROACH — with multiple sites of action
• Start with a clean field, using either a burndown herbicide application or tillage. Use a broad- spectrum soil residual herbicide with different sites of action, followed by a timely postemergence application that contains multiple sites of action, including an Enlist ® herbicide and a product with extended residual activity. • If resistance is suspected, treat weed escapes with a herbicide that has a site of action other than Group 4 or 9 (if Enlist Duo ® herbicide was used) or Group 4 (if Enlist One ® herbicide was used) and/or use nonchemical methods to remove escapes, as practical, with the goal of preventing seed, root or tuber production. • Utilize sequential applications of herbicides with alternative sites of action. • Rotate the use of an Enlist herbicide with non-Group 4 herbicides (when using Enlist One herbicide) and non-Group 9 herbicides (when using Enlist Duo herbicide). • Never use Enlist One herbicide alone. Always plan a program approach with Enlist One herbicide plus additional qualified tank-mix partners containing non-Group 4 herbicides or sequential postemergence applications of non-Group 4 herbicides. • Avoid using more than two applications of an Enlist herbicide and any other Group 4 or Group 9 herbicide (when using Enlist Duo herbicide) or Group 4 (when using Enlist One herbicide) within a single growing season unless in conjunction with another site of action herbicide with an overlapping spectrum.
Report any incidence of nonperformance of an Enlist ® herbicide against a particular weed species to a representative or 855-ENLIST1 (855-365-4781).
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