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Dicamba Rule Changes and Recommendations - May 3, 2021
On May 3rd, 2021, the Arkansas State Plant Board (ASPB) met and voted to alter the 2021 rules
for over-the-top use of dicamba in soybean and cotton. In addition to federal label
requirements, the specific Arkansas rules (available here: Arkansas Dicamba Emergency Rules) are as follows:
These changes were passed by the ASPB as an emergency rule, meaning they went into
effect immediately following approval by the Arkansas legislature and governor which
occurred on Saturday, May 8th.
In addition, make sure to follow all federal label requirements such as using approved
nozzles, tank-mix partners, and other application factors (available on product-specific
websites), and add the required volatility reduction agent (VRA) in tank-mix (Sentris
or Vaporgrip Xtra). Also, if no Arkansas specific buffers apply, the federal label
still requires a 240-foot downwind buffer in all application situations. Refer to
product specific labels for more information on this buffer requirement.
On May 6th, 2021, the Arkansas Supreme Court ruled the current appointment process for the ASPB
was unconstitutional and declared that the 9 individuals not appointed by the governor
must be immediately removed from the board. It appears that this ruling does not impact
the change in dicamba rules accepted by the ASPB on May 3rd, but will change the process in which ASPB members are selected to board positions
As far as our weed control recommendations for dicamba-resistant soybean and cotton,
they have remained relatively unchanged.
It is important to start clean and use a robust PRE program with multiple, effective
modes-of-action, 2 is always better than 1. Metribuzin should be a base tank-mix partner
in soybean PRE programs, and some combination of Brake, Caparol, and Cotoran should
be used in cotton PRE programs. Overlap residuals 14 to 21 days following the PRE;
make sure to never let pigweed get out of the ground. Spray dicamba early in the growing
season to avoid hot temperatures and take advantage of its residual activity. In XtendFlex
systems, the best weed control has been achieved when dicamba was applied early followed
by glufosinate (Liberty) 14 days later.
For the most up-to-date Arkansas weed science information, please make sure to: