INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

GROUP B/2 RESISTANT FERAL RYE
(Secale cereale)


ALS inhibitors (B/2)

United States, Colorado
INTRODUCTION FERAL RYE
Feral Rye (Secale cereale) is a monocot weed in the Poaceae family.  In Colorado this weed first evolved resistance to Group B/2 herbicides in 2018 and infests Winter wheat.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to imazamox and they may be cross-resistant to other Group B/2 herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Nov 28, 2019 )

Common NameFeral Rye
SpeciesSecale cereale
GroupALS inhibitors (B/2)
Herbicidesimazamox
LocationUnited States, Colorado
Year2018
Situation(s)Winter wheat
Contributors - (Alphabetically)Todd Gaines, Neeta Soni, Phillip Westra, and Eric Westra 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Feral Rye biotype with this Feral Rye biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.
 
Genetics

Genetic studies on Group B/2 resistant Feral Rye have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group B/2 resistant Feral Rye from Colorado please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

TODD GAINES
Assistant Professor
Colorado State University
Bioagricultural Sciences and Pest Management
1177 Campus Delivery
Fort Collins, 80523, Colorado
United States
Email Todd Gaines
NEETA SONI
Graduate Student
Colorado State University
Bioagricultural Sciences and Pest Management
1177 Campus Delivery
Fort Collins, 80523, Colorado
United States
Email Neeta Soni
PHILLIP WESTRA
Professor and Extension Specialist
Colorado State University
Dept. of Bioagriculture Sci. & Pest Mgt
112 Weed Lab
Fort Collins, 80523, Colorado
United States
Email Phillip Westra
Web   : Web Site Link
ERIC WESTRA
Graduate Student
Colorado State University
Bioagricultural Sciences and Pest Management
401 N. Sherwood St.
Fort Collins, 80521, Colorado
United States
Email Eric Westra
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Colorado have been instrumental in providing you this information. Particular thanks is given to Todd Gaines, Neeta Soni, Phillip Westra, and Eric Westra for providing detailed information.
Herbicide Resistant Feral Rye Globally
(Secale cereale)
Herbicide Resistant Feral Rye Globally
(Secale cereale)
Drag a column header and drop it here to group by that column
Herbicide Resistant Feral Rye Globally
(Secale cereale)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Colorado) United StatesColorado2018 Winter wheat imazamox 45 ALS inhibitors (B/2)
351Secale cerealeFeral Rye18182
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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Friday, December 4, 2020 .  Available  www.weedscience.org Copyright © 1993- 2020 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.