- This year is the final year for a two-year EPA registration of the three new dicamba formulations: Xtendimax with VaporGrip Technology; Engenia Herbicide; DuPont FeXapan Herbicide.
“If EPA amends the registration (beyond 2018), we will not amend it with an expiration date later than 2021,” says Reuben Baris, with the EPA office of pesticide programs. He explains this time frame allows the agency to monitor any potential increase or change in weed resistance patterns linked to dicamba-tolerant crop applications.
- 2017 had more than 2,700 crop injury cases reported with an estimated 3.6 million acres affected.
“As soon as numbers were reported, they were outdated, that speaks to how rapidly this was changing.
EPA in cooperation with state regulators and the registrants had to do something to change the outcome for 2018,” Baris says.
- This year, all new dicamba formulations are Restricted Use Pesticides. Only certified applicators can purchase these products and a record of sale must be kept by pesticide applicators.
“We recognize there is a clear need and benefit for the use of dicamba on dicamba tolerant crops to manage weed resistance. But we found through our investigations that we needed to remove ambiguity and inconsistencies as much as possible across the registered products. With the updated labels for 2018, there was a clear need to address application practices and tank clean out procedure,” Baris says.
- Part of the new labels required dicamba-specific training. The dicamba-specific sessions do not take the place of certified applicator training—it is an additional training session.
In Illinois, for example, more than 11,000 applicators have attended a classroom training for dicamba application in 2018.
- There are lots of online resources about dicamba application.
To help retailers make the sound decisions regarding handling, mixing and application, the Agricultural Retailers Association has aggregated guidance and best management practices from the dicamba registrants.
Corteva Bulk Handling Guidance
Monsanto XtendiMax Best Management Practices
Here is some additional information from the registrants.
The Illinois Dicamba Training website features a bulletin written by Dr. Aaron Hager, which includes recordkeeping forms, guides to keeping weather records, a guide on inversions, and other helpful resources.
- Although this discussion focuses on one pesticide, Dr. Stanley Culpepper with the University of Georgia say it highlights the fundamentals to apply to all pesticide applications for optimum success. He breaks it down into 15 factors influencing every application’s success:
- Spray tip
- Spray pressure
- Sprayer speed
- Boom height
- Tank cleanout
- Drift control agent
- Proper formulation
- Land terrain
- Size of crop
- Herbicide footprint/surrounding crops
- Residue tolerance
- The Agricultural Retailers Association will host a webinar April 11 promoting the proper use of dicamba. The webinar will cover new label requirements, best management practices for application, and the science behind the regulations.
The April 11 webinar will feature Rick Keigwin of the EPA Office of Pesticide Programs and Dr. Stanley Culpepper, Professor, Extension Weed Scientist, University of Georgia.
Wed. April 11, 3-4 p.m. EDT
- Use of dicamba in-season continues to be fought in Arkansas’s state courts.
Previously, the Arkansas Plant Board passed an in-season application ban for dicamba with a cutoff date of April 15.
There have been a handful of suits in the state since then. One suit was dismissed in February.
Another suit in Pulaski County had Circuit Judge Tim Fox dismiss the case on Friday but then say that the six farmers who brought the suit weren’t given their due process rights and could apply dicamba past the Plant Board’s cutoff date. That brought the reaction from the state’s attorney general, Leslie Rutledge, to ask the state Supreme Court to put a stay on Judge Fox’s ruling. This story continues to develop.