INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT CRYSTALLINE ICEPLANT
(Mesembryanthemum crystallinum)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Australia, South Australia
INTRODUCTION CRYSTALLINE ICEPLANT
Crystalline Iceplant (Mesembryanthemum crystallinum) is a dicot weed in the Aizoaceae family.  In South Australia this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2005 and infests Wheat.   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 chlorsulfuron 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 Sep 01, 2005 )

Common NameCrystalline Iceplant
SpeciesMesembryanthemum crystallinum
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicideschlorsulfuron
LocationAustralia, South Australia
Year2005
Situation(s)Wheat
Contributors - (Alphabetically)Christopher Preston 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Crystalline Iceplant biotype with this Crystalline Iceplant 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 Crystalline Iceplant 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 Crystalline Iceplant from South Australia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CHRISTOPHER PRESTON
University Of Adelaide - Waite Campus
Crc For Australian Weed Management And School Of Agriculture
Box 2146
Adelaide, 5064, South Australia
Australia
Email Christopher Preston

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in South Australia have been instrumental in providing you this information. Particular thanks is given to Christopher Preston for providing detailed information.
Herbicide Resistant Crystalline Iceplant Globally
(Mesembryanthemum crystallinum)
Herbicide Resistant Crystalline Iceplant Globally
(Mesembryanthemum crystallinum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Crystalline Iceplant Globally
(Mesembryanthemum crystallinum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (South Australia) AustraliaSouth Australia2005 Wheat chlorsulfuron 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		234Mesembryanthemum crystallinumCrystalline Iceplant5255
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HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Friday, September 25, 2026.  Available at  www.weedscience.org

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