International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Fimbristylis miliacea)

ALS inhibitors (B/2)

Venezuela, Guárico, Portuguesa
Globe Fringerush (Fimbristylis miliacea) is a monocot weed in the Cyperaceae family.  In Venezuela this weed first evolved resistance to Group B/2 herbicides in 2010 and infests Rice.   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 imazapyr, imazethapyr, and pyrazosulfuron-ethyl 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Feb 24, 2015 )

Common NameGlobe Fringerush
SpeciesFimbristylis miliacea
GroupALS inhibitors (B/2)
Herbicidesimazapyr, imazethapyr, and pyrazosulfuron-ethyl
LocationVenezuela, Guárico, Portuguesa
Contributors - (Alphabetically)Aida Ortiz 
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Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Globe Fringerush biotype with this Globe Fringerush biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group B/2 resistant Globe Fringerush 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 Globe Fringerush from Venezuela 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 Globe Fringerush from Venezuela please update the database.
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Universidad Central De Venezuela
Avenida Universidad. Campus Maracay
Maracay, 2101, Aragua
Email Aida Ortiz
Web   : Web Site Link


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Venezuela have been instrumental in providing you this information. Particular thanks is given to Aida Ortiz for providing detailed information.
Herbicide Resistant Globe Fringerush Globally
(Fimbristylis miliacea)
Herbicide Resistant Globe Fringerush Globally
(Fimbristylis miliacea)
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Herbicide Resistant Globe Fringerush Globally
(Fimbristylis miliacea)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2001 Rice pyrazosulfuron-ethyl 5 ALS inhibitors (B/2)
90Fimbristylis miliaceaGlobe Fringerush5117
2 MalaysiaMalaysia 1989 Rice 2,4-D 28 Synthetic Auxins (O/4)
90Fimbristylis miliaceaGlobe Fringerush141
3 VenezuelaVenezuela 2010 Rice imazapyr, imazethapyr, and pyrazosulfuron-ethyl 80 ALS inhibitors (B/2)
90Fimbristylis miliaceaGlobe Fringerush5548
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, January 23, 2021 .  Available
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