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, Ohio
INTRODUCTION SHATTERCANE
Shattercane (Sorghum bicolor) is a monocot weed in the Poaceae family.  In Ohio this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2000 and infests Corn (maize).   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 imazethapyr, 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 Jan 31, 2005 )

Common NameShattercane
SpeciesSorghum bicolor
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesimazethapyr, nicosulfuron, and primisulfuron-methyl
LocationUnited States, Ohio
Year2000
Situation(s)Corn (maize)
Contributors - (Alphabetically)Jeff Stachler 
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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

Studies on the mechanism of resistance of Group 2 (Legacy B) resistant Shattercane from Ohio 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 2 (Legacy B) resistant Shattercane from Ohio please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JEFF STACHLER
Extension Agronomist - Sugarbeet/weed Science
North Dakota State University, University of Minnesota
Plant Sciences
Loftsgard Hall 474E NDSU Dept #7670
PO Box 6050
Fargo, 58108-6050, North Dakota
United States
Email Jeff Stachler
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Ohio have been instrumental in providing you this information. Particular thanks is given to Jeff Stachler for providing detailed information.
Herbicide Resistant Shattercane Globally
(Sorghum bicolor)
Herbicide Resistant Shattercane Globally
(Sorghum bicolor)
Drag a column header and drop it here to group by that column
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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