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Dicamba: A Guide to Your Label

Posted By Doane Advisory Services | March 20, 2017 8:36 PM CDT

Source by  Sonja Begemann
Farm Journal
Seeds and Crop Production Editor

http://www.agweb.com/article/dicamba-a-guide-to-your-label-naa-sonja-begemann/

About two years. That’s all the time you have to prove to the Environmental Protection Agency (EPA) you and your neighbors will follow new dicamba formulation label requirements, or the agency could let its approval expire at the end of 2018. “With the possibility of spraying in June and July on lots of additional acres, remember broadleaf plants are very, very sensitive to dicamba,” says Mandy Bish, senior research specialist at the University of Missouri’s weed science program. “It only takes a small amount to injure nontarget plants. That’s the difference between dicamba and other herbicides you’re used to using.”

Dicamba kills susceptible plants by creating a hormone imbalance that interferes with cell division, cell enlargement and protein synthesis, eventually killing the plant. In 2016, more than 200,000 acres were damaged from illegal dicamba use of unapproved, volatile formulations of the herbicide. While new formulations promise reduced volatility, stewardship and following the herbicides’ label are still critical to prove to EPA you can use dicamba ethically long term.

Monsanto, DuPont and BASF offer new over-the-top formulations of dicamba this year. Monsanto’s XtendiMax uses VaporGrip technology to reduce volatility and help minimize drift. DuPont’s FeXapan also uses VaporGrip technology to reduce drift and volatility risks. BASF’s Engenia uses a new salt, BAPMA, to reduce volatility. The labels for these formulations are optimized to protect sensitive crops and include specifi c requirements to reduce drift risk that could cause damage.

Beware of Off-Target Movement

Drift refers to particle movement while volatility refers to evaporation. Review conventional and supplemental herbicide labels as well as EPA-mandated company websites for application instructions. See state restrictions.

Nozzle Type

Engenia: Use only approved nozzles for over-the-top application in dicamba tolerant crops. Only TTI11004 and TTI11005 are currently approved, but check tank mix website for updates.

(Pg. 3 of the Engenia supplemental label)

FeXapan and XtendiMax: Apply large droplets with specific nozzles. Don’t use flat fan nozzles that produce driftable fines. Use TTI11004 or nozzles listed on the EPA-mandated product websites.

(Pg. 6 of the FeXapan supplemental label)

(Pg. 2 of the XtendiMax supplemental label)


Spray Volume and Pressure

Engenia: Don’t exceed nozzle manufacturer’s advised pressures. Lower pressure produces larger drops. When higher flow rates are needed, use large orifice nozzles instead of increasing pressure. Make sure sprayer rate hardware doesn’t allow pressure to increase above allotted range.

(Pg. 3 of the Engenia supplemental label)

FeXapan & XtendiMax: Spray at least 10 gal. per acre with 63 psi max in TTI11004. Visit EPA-mandated websites for other nozzle information. Use a higher spray volume in dense vegetation.

(Pg. 7 of the FeXapan supplemental label)

(Pg. 2 of the XtendiMax supplemental label)


Equipment Ground Speed

Stay under 15 mph to reduce drift potential—slower speeds result in better coverage.

Engenia:

(Pg. 3 of the Engenia supplemental label)

FeXapan & XtendiMax:

(Pg. 7 of the FeXapan supplemental label)

(Pg. 2 of the XtendiMax supplemental label)


Spray Boom Height

Keep the boom no more than 24" above the target weed or crop canopy (if a weed is 4" tall, then no more than 28" above the ground). The lower the boom is set, the less likely droplets are exposed to wind drift or evaporation.

Engenia:

(Pg. 3 of the Engenia supplemental label)

FeXapan & XtendiMax:

(Pg. 7 of the FeXapan supplemental label)

(Pg. 2 of the XtendiMax supplemental label)


Hooded Sprayers

Hooded sprayers are optional but can help reduce drift.

FeXapan & XtendiMax:

(Pg. 6 of the FeXapan supplemental label)

(Pg. 2 of the XtendiMax supplemental label)

 


Temperature Inversions

The potential for drift increases during temperature inversions because droplets can remain suspended in the air after application and move off-target when wind speed increases. Watch for situations that increase the risk of a temperature inversion: Evenings and nights with limited cloud cover and little or no wind. Ground fog or smoke that layers and moves laterally in a concentrated cloud. Wind speeds lower than 3 mph.

Engenia:

(Pg. 3 of the Engenia supplemental label)

FeXapan & XtendiMax:

(Pg. 7 of the FeXapan supplemental label)

(Pg. 2 of the XtendiMax supplemental label)


Wind Speed

Engenia: Do not spray if wind exceeds 15 mph or is less than 3 mph unless you’re sure there is no temperature inversion. Don’t spray if wind is blowing toward neighboring specialty crops or if wind exceeds 10 mph toward sensitive crops. Additional state restrictions might apply.

(Pg. 3 of the Engenia supplemental label)

FeXapan & XtendiMax:Optimum wind speed is 3 mph to 10 mph. Do not spray if wind speed is greater than 15 mph or under 3 mph. Also, do not spray if wind direction is blowing toward non-target commercially grown sensitive crops.

(Pg. 8 of the FeXapan supplemental label)

(Pg. 2 of the XtendiMax supplemental label)


Buffers

Keep a 110' buffer when wind is spraying toward sensitive areas (if rate exceeds 22 fl . oz. per acre use a 220' buffer). Check each product label for additional details. Buffer is between the last treated row and the closest downwind edge of the treated field.

Eugenia:

(Pg. 4 of the Engenia supplemental label)

FeXapan & XtendiMax:

(Pg. 8 of the FeXapan supplemental label)

(Pg. 3 of the XtendiMax supplemental label)


Be Mindful of What, When and How Much Product Can Go in the Tank

Know what you put in the tank can affect drift and lead to crop damage if you’re not careful. Before mixing herbicide or adjuvant products, make sure the tank mix is approved.

Rate

Engenia: Dicamba tolerant soybeans— Max of 12.8 fl . oz. per application and 51.2 fl . oz. per season. Dicamba tolerant cotton—Max of 12.8 fl . oz. per application and 2 lb. dicamba acid equivalent per season.

(Pg. 4 of the Engenia supplemental label)

FeXapan & XtendiMax: Dicamba tolerant soybeans—Max of 44 fl. oz. per preplant application, 22 fl . oz. per postemergent application and max of 88 fl. oz. per season. Dicamba tolerant cotton—Max of 44 fl. oz. per preplant application, 22 fl. oz. per postemergent application and max of 88 fl . oz. per season.

(Pg. 3 of the FeXapan supplemental label)

(Pg. 1 of the XtendiMax supplemental label)


Timing

Engenia: Dicamba tolerant soybeans—Use preplant, pre-emergent and postemergent applications through R1 up to four applications (two preplant/preemergent applications totaling 25.6 fl. oz. and two postemergent totaling 25.6 fl. oz.). Dicamba tolerant cotton—Apply preplant, pre-emergent and postemergent until seven days before harvest.

(Pg. 4 of the Engenia supplemental label)

FeXapan: Dicamba tolerant soybeans—Apply preplant, preemergent and postemergent up to and including R1. Dicamba tolerant cotton—Use preplant, pre-emergent and postemergent applications up to seven days before harvest.

(Pg. 3 of the FeXapan supplemental label)

XtendiMax: Dicamba tolerant soybeans—Use within 28 days or less of preplant and up to two postemergent applications up to and including R1. Dicamba tolerant cotton—Use within 21 days or less of preplant and up to four day postemergence until seven days before harvest.

(Pg. 1 of the XtendiMax supplemental label)

Tank Mixing

Engenia, FeXapan & XtendiMax: Can only be tank mixed with specific products listed on EPA-mandated websites, which have been tested and found to not have an adverse effect on the spray drift properties of the dicamba herbicide formulation the applicator will use.

(Pg. 2 of the Engenia supplemental label)

(Pg. 4 of the FeXapan supplemental label)

(Pg. 2 of the XtendiMax supplemental label)

Before mixing:

Applicators are required to check the list of EPA-approved products within seven days of application. The tank-mix must be on the list of tested and approved products and not prohibited on the label.

Note some crop oil concentrates, high surfactant oil concentrates and methylated seed oil adjuvants can cause crop response.

Don’t tank mix products containing ammonium salts such as ammonium sulfate and urea ammonium nitrate.

Double check with drift reduction agent (DRA) manufacturers to see if approved DRA will work with spray nozzle, spray pressure and spray solution.