International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT COMMON SUNFLOWER
(Helianthus annuus)


ALS inhibitors (B/2)

United States, Missouri
INTRODUCTION COMMON SUNFLOWER
Common Sunflower (Helianthus annuus) is a dicot weed in the Asteraceae family.  In Missouri this weed first evolved resistance to Group B/2 herbicides in 1996 and infests Soybean.   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 chlorimuron-ethyl, cloransulam-methyl, flumetsulam, halosulfuron-methyl, imazaquin, imazethapyr, and oxasulfuron 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 Sep 15, 2000 )

Common NameCommon Sunflower
SpeciesHelianthus annuus
GroupALS inhibitors (B/2)
Herbicideschlorimuron-ethyl, cloransulam-methyl, flumetsulam, halosulfuron-methyl, imazaquin, imazethapyr, and oxasulfuron
LocationUnited States, Missouri
Year1996
Situation(s)Soybean
Contributors - (Alphabetically)William Johnson, Andy Kendig, and Reid Smeda 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Reid Smeda
Carroll and Ray, Atchison counties. River bottom areas. northwest, west central, and central Missouri.

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CONTROL STRATEGIES

Reid Smeda
Roundup ready beans, atrazine in corn. Remains susceptible to bentazon, lactofen, dicamba, atrazine, glyphosate, glufosinate.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Common Sunflower biotype with this Common Sunflower 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 Common Sunflower 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 Common Sunflower from Missouri please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

WILLIAM JOHNSON
Associate Professor of Weed Science
Purdue University
Botany And Plant Pathology
Lilly Hall
915 West State Street
West Lafayette, 47907-2054, Indiana
United States
Email William Johnson
Web   : Web Site Link
ANDY KENDIG
Associate Professor of Weed Science
University Of Missouri
Botany And Plant Pathology
Lilly Hall
14901 Asgrow Rd
Portageville, 63873, Missouri
United States
Email Andy Kendig
Web   : Web Site Link
REID SMEDA
Assistant Professor - Weed Physiologist
University Of Missouri-Columbia
Agronomy
219 Redfield Dr
Columbia, 65211, Missouri
United States
Email Reid Smeda
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Missouri have been instrumental in providing you this information. Particular thanks is given to William Johnson, Andy Kendig, and Reid Smeda for providing detailed information.
Herbicide Resistant Common Sunflower Globally
(Helianthus annuus)
Herbicide Resistant Common Sunflower Globally
(Helianthus annuus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Common Sunflower Globally
(Helianthus annuus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 2009 Sunflower imazamox, and tribenuron-methyl 17 ALS inhibitors (B/2)
95Helianthus annuusCommon Sunflower9929
2 United States (Kansas) United StatesKansas1996 Soybean imazethapyr 45 ALS inhibitors (B/2)
95Helianthus annuusCommon Sunflower499
3 United States (Missouri) United StatesMissouri1996 Soybean chlorimuron-ethyl, cloransulam-methyl, flumetsulam, halosulfuron-methyl, imazaquin, imazethapyr, and oxasulfuron 45 ALS inhibitors (B/2)
95Helianthus annuusCommon Sunflower1067
4 United States (South Dakota) United StatesSouth Dakota1996 Cropland imazethapyr 45 ALS inhibitors (B/2)
95Helianthus annuusCommon Sunflower1186
5 United States (Iowa) United StatesIowa1997 Corn (maize), and Soybean chlorimuron-ethyl, and imazethapyr 45 ALS inhibitors (B/2)
95Helianthus annuusCommon Sunflower5230
6 United States (Texas) United StatesTexas2015 Corn (maize) glyphosate 45 EPSP synthase inhibitors (G/9)
95Helianthus annuusCommon Sunflower15062
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, June 25, 2019 .  Available  www.weedscience.org
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