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Tips and Reminders when Managing Weeds with Dicamba Herbicides

In October 2017, the EPA revised the federal labels for Engenia®, XtendiMax® With VaporGrip® Technology and FeXapan herbicide Plus VaporGrip® Technology for use on Roundup Ready 2 Xtend® soybeans to help reduce off-target movement caused by drift, volatilization and tank contamination. These are the only dicamba herbicides approved for use on Roundup Ready 2 Xtend soybeans. Below are reminders about Roundup Ready 2 Xtend herbicide stewardship, application requirements and weed management best practices.

Follow Stewardship and Application Requirements
Dicamba-specific training is required to apply these herbicides. Review the herbicide labels and associated support websites for Engenia, XtendiMax With VaporGrip Technology or FeXapan Plus VaporGrip Technology before making an application. Michigan State University recently published the following 12 label requirement reminders for these herbicide technologies: 
  1. Mandatory training
  2. Certification and recordkeeping
  3. Application rate
  4. Application timing
  5. Downwind buffer
  6. Wind speed
  7. Tank-mixes and adjuvants
  8. Spray volume
  9. Approved nozzles
  10. Ground speed
  11. Boom height
  12. Clean spray equipment
Communicate Applications to Specialty Crop Farmers 
Another stewardship requirement is documenting and communicating dicamba-containing herbicide applications to farmers growing sensitive crops. The DriftWatch™ website for applicators and FieldWatch® site for producers provide online communities in which applicators and farmers can document application locations and sensitive crops.

Deploy Weed Management Best Practices

To maintain the viability of dicamba products, it is important to learn from what happened with glyphosate and diversify herbicides applied to Roundup Ready 2 Xtend soybeans. Engenia, XtendiMax With VaporGrip Technology and FeXapan Plus VaporGrip Technology are single site-of-action group 4 herbicides (synthetic auxins). 

For maximum weed control and resistance management, include herbicides with different sites of action in your weed management program, including a pre-emergence residual herbicide such as Prefix®, Boundary® 6.5 EC or BroadAxe® XC. For post-emergence control, apply a dicamba formulation approved for use on Roundup Ready 2 Xtend soybeans with an approved tank-mix partner for additional weed control.

Be sure to also strictly adhere to the dicamba-containing herbicide label for application timings and weed height recommendations. For example, waterhemp and Palmer amaranth control is most effective when applied before weeds exceed 4” in height. Consistency of control will drop dramatically when weed height exceeds 4”.

Contact your Golden Harvest Seed Advisor with questions or for additional agronomic insights.

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