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Availability of Enlist E3 Soybean Varieties

In 2020, soybean producers will have access to varieties with an additional option that can be used to control and/or manage potential development of herbicide resistant weeds.

Enlist E3 is a triple-stack herbicide-tolerant soybean line that allows the application of 2,4-D choline (Group 4), glyphosate (Group 9), and glufosinate (Group 10) herbicides. Enlist herbicides [Enlist Duo (2,4-D choline + glyphosate) and Enlist One (2,4-D choline)] and/or glufosinate herbicides can be applied to Enlist E3 soybean varieties from burndown through post-emergence (PE). Thus, these varieties will have tolerance to PE herbicides with three distinct modes of action that can be applied in needed concert to control and/or thwart the development of herbicide-resistant weeds.

Even though these varieties will be tolerant to 2,4-D, glyphosate, and glufosinate, two applications will be required to subject weeds growing in these varieties to all three modes of action represented by the three herbicides. That is, 2,4-D choline and glyphosate can be applied simultaneously by applying Enlist Duo herbicide, while 2,4-D choline and glufosinate can be applied simultaneously in the labeled tank mix of these two herbicide active ingredients.

According to the developers, the Enlist herbicides have near zero volatility and reduced potential for physical drift. Thus, they are designed to stay on the targeted site. The confirmation of this on a widespread basis will likely come after Enlist E3 varieties are grown on a significant acreage over a wide area and the Enlist herbicides are applied to them on that acreage.

In an article on this website, links to 15 private soybean seed company sites are provided. These links provide access to soybean seed offerings from these companies for 2020. Of the 15 linked companies, 10 offer varieties with the Enlist E3 herbicide tolerance technology. The number of Enlist E3 varieties within an indicated relative maturity (RM) range from each company follow.

Syngenta: 7 varieties from 3.5 to 4.9 RM.

Pioneer: 7 varieties from 3.8 to 4.9 RM.

Terral (REV): 4 varieties from 4.5 to 5.1 RM.

Delta Grow: 9 varieties from 4.6 to 5.2 RM.

Dyna-Gro:  8 varieties from 3.5 to 4.9 RM.

Progeny:  8 varieties from 4.2 to 5.2 RM.

Mycogen: 15 varieties from 3.5 to 4.9 RM.

AgVenture: 11 varieties from 3.5 to 5.1 RM.

Nutech:  19 varieties from 3.5 to 4.9 RM.

USG-UniSouth Genetics:  14 varieties from 3.7 to 4.9 RM.

Producers who choose to use varieties with the Enlist E3 technology are encouraged to check yield data from multiple sources to ensure that chosen Enlist E3 varieties are in fact yield-competitive with other varieties that could be used or have been used in the past. Also, they should ensure that chosen Enlist E3 varieties have the needed resistance to problematic diseases (e.g. stem canker, frogeye leaf spot) and nematodes (e.g. soybean cyst nematode) that are known to limit production in a field to be planted with seed of these varieties.

A word of caution. Both 2,4-D and dicamba are Group 4 auxin herbicides. However, Enlist E3 soybean varieties are sensitive to dicamba herbicides, and Xtend soybean varieties (tolerant of dicamba herbicides) are sensitive to 2,4-D. This adds another layer of concern for producers since they will have to ensure that accurate records of which soybean varieties are planted in which fields are kept to ensure that the correct herbicide(s) are applied to the appropriate herbicide-tolerant varieties. Click here for a list of currently available herbicide tolerance traits that are available in soybean varieties.

Composed by Larry G. Heatherly, Mar. 2020, larryheatherly@bellsouth.net