International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 2 (LEGACY B) RESISTANT SHATTERCANE
(Sorghum bicolor)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, Kansas
INTRODUCTION SHATTERCANE
Shattercane (Sorghum bicolor) is a monocot weed in the Poaceae family.  In Kansas this weed first evolved resistance to Group 2 (Legacy B) herbicides in 1996 and infests Corn (maize), and Sorghum.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to imazamox, nicosulfuron, and primisulfuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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 Apr 27, 2021 )

Common NameShattercane
SpeciesSorghum bicolor
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesimazamox, nicosulfuron, and primisulfuron-methyl
LocationUnited States, Kansas
Year1996
Situation(s)Corn (maize), and Sorghum
Contributors - (Alphabetically)Vipan Kumar, Dallas Peterson, and Curtis Thompson 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Dallas Peterson
Southwest Kansas.

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AREAS FOUND

Curtis Thompson
Recently evaluated seed gathered from three different fields from Stevens County - resistance in each fields. Primaily in Stevens county but also in Grant, Haskal, Sewet, Grey counties. Primarily SW Kansas.

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CONTROL STRATEGIES

Curtis Thompson
Roundup Ready and Liberty Link corn are alternatives for growers with ALS inhibitor resistant shattercane.

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GENERAL

Dallas Peterson
Novartis confirmed resistance.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Shattercane biotype with this Shattercane 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 HRAC Group 2 resistant Shattercane 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 2 (Legacy B) resistant Shattercane from Kansas please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

VIPAN KUMAR
Assistant Professor-Weed Science
Kansas State University
Agricultural Research Center-Hays
1232 240th Avenue
Hays, 67601, Kansas
United States
Email Vipan Kumar
Web   : Web Site Link
DALLAS PETERSON
Professor and Extension Weed Specialist
Kansas State University
Department of Agronomy
3703 Throckmorton Plant Sciences Center
1712 Claflin Road
Manhattan, KS 66506-0110, Kansas
United States
Email Dallas Peterson
Web   : Web Site Link
CURTIS THOMPSON
Extension Weed Science
Kansas State University
Agronomy
2014 Throckmorton Hall
Manhattan, 66506, Kansas
United States
Email Curtis Thompson
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 Vipan Kumar, Dallas Peterson, and Curtis Thompson for providing detailed information.
Herbicide Resistant Shattercane Globally
(Sorghum bicolor)
Herbicide Resistant Shattercane Globally
(Sorghum bicolor)
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Herbicide Resistant Shattercane Globally
(Sorghum bicolor)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Nebraska) United StatesNebraska1994 Corn (maize) primisulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		165Sorghum bicolorShattercane474
2 United States (Kansas) United StatesKansas1996 Corn (maize), and Sorghum imazamox, nicosulfuron, and primisulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		165Sorghum bicolorShattercane500
3 United States (Iowa) United StatesIowa1998 Corn (maize) imazethapyr 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		165Sorghum bicolorShattercane5229
4 United States (Ohio) United StatesOhio2000 Corn (maize) imazethapyr, nicosulfuron, and primisulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		165Sorghum bicolorShattercane5235
5 United States (Illinois) United StatesIllinois2000 Corn (maize) nicosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		165Sorghum bicolorShattercane7861
6 United States (Pennsylvania) United StatesPennsylvania2001 Corn (maize), and Soybean imazamox, imazethapyr, nicosulfuron, oxasulfuron, and primisulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		165Sorghum bicolorShattercane5121
7 United States (Virginia) United StatesVirginia2003 Corn (maize) imazapyr, imazethapyr, and nicosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		165Sorghum bicolorShattercane5204
8 United States (Indiana) United StatesIndiana2006 Corn (maize), and Soybean foramsulfuron, and nicosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		165Sorghum bicolorShattercane5281
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