Publications

Accessibility


Herbicide Resistant Traits in Minnesota and North Dakota (PS1945, Jan. 2020)

This reference guide is designed to help clarify which herbicide products can be applied to various trait packages. It will also help with understanding which herbicides can be applied safely and legally.

Tom Peters, Assistant Professor/ Extension Sugarbeet Agronomist, NDSU Plant Sciences Department

Jared Goplen, Extension Educator - Crops,University of Minnesota Extension; Joe Ikley, Assistant Professor/ Extension Weed Specialist, NDSU Plant Sciences Department; Dave Nicolai, Extension Educator - Crops, University of Minnesota Extension


Herbicide-resistance traits have created additional weed control options in alfalfa, canola, corn, soybeans, sugarbeets and wheat. However, traits may create confusion surrounding which herbicides can be applied safely and legally to the various crop trait packages. Misapplications due to confusion can be very costly and embarrassing for the producer and collaborating partners.

Weed management to prevent herbicide-resistant weeds requires a well-thought-out strategy. Best management practices should consider control of weeds present in the field as well as control during the cropping sequence. A weed management strategy including an assortment of herbicide mixtures along with nonchemical options is necessary to preserve the value of herbicides and herbicide-resistant traits.

It is important to read and follow label guidelines when applying herbicides to any crop. The label of some glyphosate products indicates they can be applied to Roundup Ready® and glyphosate-tolerant crops. Most glyphosate labels state the products are for use in Roundup Ready® crops or in crops that have the Roundup Ready® gene. Other glyphosate labels have language stating the glyphosate product can be applied to glyphosate-tolerant crops.

This reference guide is designed to help clarify which herbicide products can be applied to various trait packages. You always should check seed tags and herbicide labels to ensure missapplications do not occur.

Table 1. Alfalfa herbicide-resistant traits and herbicides that can be used in combination with resistant traits. A checkmark indicates that alfalfa herbicide trait packages have resistance to various herbicide products.a

Alfalfa Herbicide Trait

Glyphosate

Glufosinate

Growth Regulators

Conventional

Roundup Ready Alfalfab

aAlways consult herbicide labels for application requirements.
bAlways consult herbicide label to determine if glyphosate formulation is approved for RR alfalfa.

Table 2. Canola herbicide-resistant traits and herbicides that can be used in combination with resistant traits. A checkmark indicates that canola herbicide trait packages have resistance to various herbicide products.a

Canola Herbicide Trait

Glyphosate

Glufosinate

ALS Inhibitors

Conventional

Roundup Ready

Roundup Ready TruFlex

LibertyLink

Clearfield Canolab

SU Canolac

aAlways consult herbicide labels for application requirements.
bApply Beyond (imazamox) to Clearfield canola varieties.
cApply Draft (thifensulfuron and triberuron) to SU Canola varieties.

Table 3. Corn herbicide-resistant traits and herbicides that can be used in combination with resistant traits.a 
A checkmark indicates that corn herbicide trait packages have resistance to various herbicide products.b

Corn Herbicide Trait

Glyphosate

Glufosinate

2,4-D Cholinec

FOP ACCase Inhibitorsd

Conventional

Glyphosate Tolerant (GT)

LibertyLink (LL)

GT LL

Roundup Ready 2 Yield (RR2Y)

RR2Y LLe

Enlist

aTrait names often refer to insect resistance traits (Agrisure, Optimum, Yieldgard, etc.). Be sure to consult seed tags and product information to ensure herbicide trait packages.
bAlways consult herbicide labels for application requirements.
c2,4-D is labeled for corn. Only approved 2,4-D choline formulations are permitted for applications to Enlist corn (Enlist Duo, Enlist One) at higher rates or later stages of corn growth.
dAssure II only and not other FOP or ACCase inhibitors.
eAlways consult herbicide label to determine if glyphosate formulation is approved for RR corn.

Table 4. Soybean herbicide-resistance traits and herbicides that can be used in combination with resistant traits.
A checkmark indicates that soybean herbicide trait packages have resistance to various herbicide products.a

Soybean Herbicide Trait

Glyphosate

Glufosinate

2,4-D Cholineb

Dicambac

HPPD Inhibitorsd

Conventional

Glyphosate Tolerant (GT)

Roundup Readye

Roundup Ready 2 Yielde

Roundup Ready 2 Yield Xtende

Roundup Ready 2 Yield Xtendflexf

LibertyLink (LL)

LLGT27d

Enlist

Enlist E3

GT27

aAlways consult herbicide labels for application requirements.
bOnly approved 2,4-D choline formulations (Enlist Duo, Enlist One) are permitted for over-the top applications to Enlist and Enlist E3 soybeans.
cOnly approved dicamba formulations (Engenia, FeXapan, Tavium, XtendiMax) are permitted for over-the-top application to Xtend and XtendFlex soybeans.
dGT27 and LLGT27 are resistant to isoxaflutole preemergence. No HPPD-inhibiting herbicide is approved for use in soybeans in the U.S. as of January 2020.
eAlways consult herbicide label to determine if glyphosate formulation is approved for RR soybeans.
fNot approved for commercial production in the U.S. as of January 2020.

Table 5. Sugarbeet herbicide-resistant traits and herbicides that can be used in combination with resistant traits. A checkmark indicates that sugarbeet herbicide trait packages have resistance to various herbicide products.a

Sugarbeet Herbicide Trait

Glyphosate

Glufosinate

Growth Regulators

Conventional

Roundup Ready Sugarbeetsb

aAlways consult herbicide labels for application requirements.
bAlways consult herbicide label to determine if glyphosate formulation is approved for RR sugarbeets.

Table 6. Wheat herbicide-resistant traits and herbicides that can be used in combination with resistant traits. A checkmark indicates that wheat herbicide trait packages have resistance to various herbicide products.a

Wheat Herbicide Trait

Glyphosate

Glufosinate

ALS Inhibitors

Conventional

Clearfield Wheatb

aAlways consult herbicide labels for application requirements.
bApply Beyond (imazamox) to Clearfield wheat varieties.

*This publication is adapted from Butts et al. 2019. Herbicide resistance traits: quick reference guide. MP544. Available at www.uaex.edu/publications/PDF/MP544.pdf

For more information on this and other topics, see www.ndsu.edu/extension

Creative Commons License
Feel free to use and share this content, but please do so under the conditions of our Creative Commons license and our Rules for Use. Thanks.