International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT SPOTTED SPURGE
(Chamaesyce maculata)


ALS inhibitors (B/2)

United States, Georgia
INTRODUCTION SPOTTED SPURGE
Spotted Spurge (Chamaesyce maculata) is a dicot weed in the Euphorbiaceae family.  In United States this weed first evolved resistance to Group B/2 herbicides in 2014 and infests Turf.   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 metsulfuron-methyl 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 May 02, 2016 )

Common NameSpotted Spurge
SpeciesChamaesyce maculata
GroupALS inhibitors (B/2)
Herbicidesmetsulfuron-methyl
LocationUnited States
Year2014
Situation(s)Turf
Contributors - (Alphabetically)Scott Mcelroy 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Spotted Spurge biotype with this Spotted Spurge 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 Spotted Spurge 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 Spotted Spurge from United States 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 Spotted Spurge from United States please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

SCOTT MCELROY
Assistant Professor
Auburn University
Depart. Of Agronomy And Soils
201 Funchess Hall
Auburn, 36830, Alabama
United States
Email Scott Mcelroy
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in United States have been instrumental in providing you this information. Particular thanks is given to Scott Mcelroy for providing detailed information.
Herbicide Resistant Spotted Spurge Globally
(Chamaesyce maculata)
Herbicide Resistant Spotted Spurge Globally
(Chamaesyce maculata)
Drag a column header and drop it here to group by that column
Herbicide Resistant Spotted Spurge Globally
(Chamaesyce maculata)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Georgia) United StatesGeorgia2014 Turf metsulfuron-methyl 45 ALS inhibitors (B/2)
332Chamaesyce maculataSpotted Spurge13035
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, April 26, 2017 .  Available  www.weedscience.org
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