International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 2 (LEGACY B) RESISTANT SHATTERCANE
(Sorghum bicolor)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, Pennsylvania
INTRODUCTION SHATTERCANE
Shattercane (Sorghum bicolor) is a monocot weed in the Poaceae family.  In Pennsylvania this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2001 and infests Corn (maize), and Soybean.   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, imazethapyr, nicosulfuron, oxasulfuron, 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 Oct 16, 2002 )

Common NameShattercane
SpeciesSorghum bicolor
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesimazamox, imazethapyr, nicosulfuron, oxasulfuron, and primisulfuron-methyl
LocationUnited States, Pennsylvania
Year2001
Situation(s)Corn (maize), and Soybean
Contributors - (Alphabetically)William Curran 
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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 Pennsylvania please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

WILLIAM CURRAN
Professor of Weed Science
Pennsylvania State University
Department of Plant Science
423 Agricultural Sciences and Industries Building
University Park, 16802, Pennsylvania
United States
Email William Curran
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Pennsylvania have been instrumental in providing you this information. Particular thanks is given to William Curran 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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