Syngenta Soybean and Cotton Herbicides Cleared for Tank Mixes

Using multiple sites of action every year is key to preventing herbicide resistance.
Plant image from iStock
Soybean and cotton growers will have more weed management options in 2018 because the U.S. Environmental Protection Agency (EPA) recently cleared several Syngenta herbicide tank-mix options for inclusion with both XtendiMax® with VaporGrip® Technology and Engenia® herbicides. Syngenta herbicide tank-mix options will be available for use on Roundup Ready 2 Xtend® soybeans and Bollgard II® XtendFlex® cotton traits once listed on www.xtendimaxapplicationrequirements.com and www.engeniatankmix.com and will include the following products:


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“The Syngenta soybean and cotton portfolios provide the most effective dicamba spray programs through overlapping residual applications and multiple effective sites of action,” says John Appel, herbicide product lead at Syngenta. “For example, a soybean program of Boundary followed by dicamba plus Sequence provides residual control and includes four different sites of action, offering growers peace of mind against even the toughest weeds.”

University researchers stress the importance of diversifying sites of action within a weed management system. In continuous crop systems with early and late post-emergence applications with one site of action, resistance can lead to weed control failure in just a few years of use. By comparison, the addition of a pre-emergence herbicide with two effective sites of action can delay resistance for more than a decade in most cases.

Using residual herbicide tank mixes with dicamba is also necessary to help delay the onset of resistance to the technology. “Unless dicamba is used responsibly in combination with other pre- and post-emergence herbicides, the technology will be overextended and eventually fail,” says Appel. “We can’t afford to put the kind of selection pressure on dicamba as was done to glyphosate.”

“The Syngenta soybean and cotton portfolios provide the most effective dicamba spray programs through overlapping residual applications and multiple effective sites of action.”

John Appel

All of the recently cleared Syngenta herbicide tank mixes have been tested according to EPA-approved protocol, and the results are certified in accordance to the terms and conditions of registration for XtendiMax and Engenia. The testing verifies that the addition of these tank-mix partners does not alter drift charactistics.*

Syngenta herbicides cleared for tank mixing with XtendiMax and Engenia may be used only once they are listed on the following websites: www.xtendimaxapplicationrequirements.com and www.engeniatankmix.com. The listings will happen within 90 days of EPA clearance. Syngenta does not recommend using any dicamba herbicide tank mixes until they are posted on these websites.

Syngenta is also currently pursuing dicamba tank-mix clearance for Envoke®, Flexstar (with Engenia), Fusilade® DX and Gramoxone® SL 2.0 herbicides.

*Check www.xtendimaxapplicationrequirements.com and www.engeniatankmix.com for approved drift reduction agents.