International Survey of Herbicide-Resistant Weeds

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(Fimbristylis miliacea)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Brazil, Santa Catarina
Globe Fringerush (Fimbristylis miliacea) is a monocot weed in the Cyperaceae family.  In Brazil this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2001 and infests Rice.   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 pyrazosulfuron-ethyl 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.

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 Jun 19, 2002 )

Common NameGlobe Fringerush
SpeciesFimbristylis miliacea
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
LocationBrazil, Santa Catarina
Contributors - (Alphabetically)José Noldin 
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Confirmation Tests

Greenhouse 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 HRAC Group 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

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 Globe Fringerush from Brazil please update the database.
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Weed Scientist
Epagri - Agri. And Extn Inst. For Santa Catarina State
Itajai Experiment Station
Dept of Agronomy Horticulture
PO Box 830915, 362 Plant Science
Itajaí, 88301-970, Santa Catarina
Email José Noldin


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Brazil have been instrumental in providing you this information. Particular thanks is given to José Noldin for providing detailed information.
Herbicide Resistant Globe Fringerush Globally
(Fimbristylis miliacea)
Herbicide Resistant Globe Fringerush Globally
(Fimbristylis miliacea)
Drag a column header and drop it here to group by that column
Herbicide Resistant Globe Fringerush Globally
(Fimbristylis miliacea)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2001 Rice pyrazosulfuron-ethyl 5 Inhibition of Acetolactate Synthase (B/2)
90Fimbristylis miliaceaGlobe Fringerush5117
2 MalaysiaMalaysia 1989 Rice 2,4-D 28 Auxin Mimics (O/4)
90Fimbristylis miliaceaGlobe Fringerush141
3 VenezuelaVenezuela 2010 Rice imazapyr, imazethapyr, and pyrazosulfuron-ethyl 80 Inhibition of Acetolactate Synthase (B/2)
90Fimbristylis miliaceaGlobe Fringerush5548
Literature about Similar Cases

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