International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT HENBIT DEADNETTLE
(Lamium amplexicaule)


ALS inhibitors (B/2)

United States, Kansas
INTRODUCTION HENBIT DEADNETTLE
Henbit Deadnettle (Lamium amplexicaule) is a dicot weed in the Lamiaceae family.  In Kansas this weed first evolved resistance to Group B/2 herbicides in 2014 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 chlorsulfuron, and propoxycarbazone-sodium 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 Feb 24, 2015 )

Common NameHenbit Deadnettle
SpeciesLamium amplexicaule
GroupALS inhibitors (B/2)
Herbicideschlorsulfuron, and propoxycarbazone-sodium
LocationUnited States, Kansas
Year2014
Situation(s)Winter wheat
Contributors - (Alphabetically)Amar Godar, Mithila Jugulam, Dallas Peterson, Doug Shoup, and Vijay Varanasi 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Vijay Varanasi

Poster presented at NCWSS 2014 meeting in Minneapolis 

Confirmation and Characterization of ALS-inhibitor Resistance in Henbit (Lamium amplexicaule L.) 
Vijay K. Varanasi, Amar S. Godar, Dallas E. Peterson, Doug Shoup, Mithila Jugulam  

Get the PDF of the Poster Here

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Henbit Deadnettle biotype with this Henbit Deadnettle 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 Henbit Deadnettle 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

Studies on the mechanism of resistance of Group B/2 resistant Henbit Deadnettle from Kansas indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Henbit Deadnettle from Kansas please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

AMAR GODAR
Ph.d. Student
Kansas State University
Agronomy
3719 Throckmotron Plant Sciences Center
Manhattan, 66506, Kansas
United States
Email Amar Godar
Web   : Web Site Link
MITHILA JUGULAM
Assistant Professor
Kansas State University
Department of Agronomy
3703 Throckmorton Ctr.
Manhattan, 66506, Kansas
United States
Email Mithila Jugulam
Web   : Web Site Link
DALLAS PETERSON
Professor
Kansas State University
Department of Agronomy
2004 Throckmorton Plant Sciences Center
Manhattan, 66506, Kansas
United States
Email Dallas Peterson
Web   : Web Site Link
DOUG SHOUP
Associate Professor
Kansas State University
Southeast Area Extension Office
308 West 14th Road
Chanute, 66720, Kansas
United States
Email Doug Shoup
Web   : Web Site Link
VIJAY VARANASI
Research Associate
Kansas State University
Agronomy
3722 Throckmorton Plant Sciences Center
Manhattan, 66506, Kansas
United States
Email Vijay Varanasi
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Kansas have been instrumental in providing you this information. Particular thanks is given to Amar Godar, Mithila Jugulam, Dallas Peterson, Doug Shoup, and Vijay Varanasi for providing detailed information.
Herbicide Resistant Henbit Deadnettle Globally
(Lamium amplexicaule)
Herbicide Resistant Henbit Deadnettle Globally
(Lamium amplexicaule)
Drag a column header and drop it here to group by that column
Herbicide Resistant Henbit Deadnettle Globally
(Lamium amplexicaule)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Kansas) United StatesKansas2014 Winter wheat chlorsulfuron, and propoxycarbazone-sodium 45 ALS inhibitors (B/2)
323Lamium amplexicauleHenbit Deadnettle10970
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, June 27, 2017 .  Available  www.weedscience.org
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