New option launched to manage resistant weeds in soybeans

Enlist E3 soybeans are resistant to multiple herbicides meaning more options to deal with weed issues

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Ontario farmers will have more options to manage herbicide-resistant weeds with the launch of Enlist E3 soybeans in Canada.

E3 soybeans are resistant to 2,4-D, glyphosate and glufosinate herbicides. That provides more flexibility when spraying fields that have resistant weeds, which are becoming an increasing problem in Ontario, especially when it comes to glyphosate.

Why it matters: Herbicide-resistant weeds are becoming a greater problem for Ontario farmers and more control tools are needed.

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The E3 system will be available across Canada in 2019 in soybeans sold under Corteva Agriscience’s new Brevant seed brand, says Jeff Loessin, who manages marketing of corn, soybeans and wheat for Brevant and Pioneer in Canada for Corteva.

E3 soybeans are expected to be available in Canada from Pioneer in 2020.

Brevant seeds are available through agri-retailers.

“What we’ve always focused in on is the traits, the herbicides and then there’s the stewardship component of it as well,” said Loessin in an interview. “Our recommendation is not just to rely on Enlist Duo herbicides in all those applications, you use the different modes of action.”

The E3 system was created to be used with Enlist Duo, a Corteva mix of glyphosate and a new formulation of 2,4-D. Past 2,4-D formulations used ester or amines. The new 2,4-D is a choline and that helps make it more stable than past 2,4-D sprays.

The herbicide has been used in Ontario the past few years on corn and in fields growing the E3 soybeans for seed. It’s used in cotton in the southern United States, where Loessin says the herbicide resistance problem is greatest. It’s also a hot climate for spraying 2,4-D and he says the new formulation has worked well there.

The E3 system won out over a soybean line also developed at the same time that is resistant to Enlist Duo and contains Roundup Ready2 Yield traits and genetics.

Loessin says the E3 system won out because it is a single gene insertion molecular stack. That compares to the separate stack that would be included in the Ready2 Yield version. One approval is simpler, especially in the European market.

With the approval of the E3 trait by the Philippines in January, the trait is now allowed in all major export markets. That resulted in a launch in the U.S. of E3 soybeans this year as well as in Canada.

About the author


John Greig

John Greig has spent his career in agriculture journalism and communications. He lives on a farm near Ailsa Craig, Ontario. Contact John at [email protected] or follow him on Twitter @jgreig



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