International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT CROWN DAISY
(Chrysanthemum coronarium)


ALS inhibitors (B/2)

Israel
INTRODUCTION CROWN DAISY
Crown daisy (Chrysanthemum coronarium) is a dicot weed in the Asteraceae family.  In Israel this weed first evolved resistance to Group B/2 herbicides in 2000 and infests Wheat.   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 chlorsulfuron, flumetsulam, imazethapyr, procarbazone-sodium, pyrithiobac-sodium, and tribenuron-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 Jul 28, 2004 )

Common NameCrown daisy
SpeciesChrysanthemum coronarium
GroupALS inhibitors (B/2)
Herbicideschlorsulfuron, flumetsulam, imazethapyr, procarbazone-sodium, pyrithiobac-sodium, and tribenuron-methyl
LocationIsrael
Year2000
Situation(s)Wheat
Contributors - (Alphabetically)Baruch Rubin, and Avi Tal 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Crown daisy biotype with this Crown daisy 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 Crown daisy indicate that the inheritance is determined by a one gene, semi dominant, nuclear trait.  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 Crown daisy from Israel 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 Crown daisy from Israel please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

BARUCH RUBIN
Professor
Hebrew University Of Jerusalem
Inst. Plant Sci. & Genetics In Agriculture
Faculty Of Agric.
Food & Environm.
Rehovot, 76100, Israel
Israel
Email Baruch Rubin
AVI TAL
Professor
Hebrew University Of Jerusalem - Agric., Food & Env. Sci.
The Institute Of Plant Sciences And Genetics
Dept of Entomology
243 Natural Science Bldg,
Rehovot, 76100, Israel
Israel
Email Avi Tal

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Israel have been instrumental in providing you this information. Particular thanks is given to Baruch Rubin, and Avi Tal for providing detailed information.
Herbicide Resistant Crown daisy Globally
(Chrysanthemum coronarium)
Herbicide Resistant Crown daisy Globally
(Chrysanthemum coronarium)
Drag a column header and drop it here to group by that column
Herbicide Resistant Crown daisy Globally
(Chrysanthemum coronarium)
#CountryFirstYearSituationActive IngredientsSite of Action
1 IsraelIsrael 2000 Wheat chlorsulfuron, flumetsulam, imazethapyr, procarbazone-sodium, pyrithiobac-sodium, and tribenuron-methyl 23 ALS inhibitors (B/2)
228Chrysanthemum coronariumCrown daisy5220
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, December 6, 2019 .  Available  www.weedscience.org
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