<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Chrysanthemum coronarium from Israel

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT CROWN DAISY
(Chrysanthemum coronarium)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

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 2 (Legacy B) herbicides in 2000 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, flumetsulam, imazethapyr, procarbazone-Na, pyrithiobac-sodium, and tribenuron-methyl 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.

QUIK STATS (last updated Jul 28, 2004 )
Common Name	Crown daisy
Species	Chrysanthemum coronarium
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	chlorsulfuron, flumetsulam, imazethapyr, procarbazone-Na, pyrithiobac-sodium, and tribenuron-methyl
Location	Israel
Year	2000
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 HRAC Group 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 2 (Legacy B) 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 2 (Legacy B) 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.

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Herbicide Resistant Crown daisy Globally
(Chrysanthemum coronarium)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Israel

2000

Wheat

chlorsulfuron, flumetsulam, imazethapyr, procarbazone-Na, pyrithiobac-sodium, and tribenuron-methyl

Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)

Literature about Similar Cases

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Tal, A. ; Rubin, B.. 2004. Occurrence of resistant Chrysanthemum coronarium to ALS inhibiting herbicides in Israel. Resistant Pest Management Newsletter 13 : 31 - 33.

A greenhouse experiment was conducted on C. coronarium cultivars Gilat and Beeri to determine the resistance of C. coronarium, on both whole plant and enzyme levels, to herbicides, i.e. sulfonylureas (SU), imidazolinones, triazolopyrimidines, pyrimidinylthiobenzoates and sulfonylaminocarbonyltriazolinones. In a related experiment to identify the differences in the nucleotide and amino acid sequences of acetolactate synthase (ALS) between the resistant (R) and susceptible (S) biotypes. Dose-response experiments at the whole plant level have revealed that the R biotype from Gilat was highly resistant to tribenuron (>792-fold) relative to the susceptible wild-type. Other SU herbicides such as iodosulfuron, chlorsulfuron and sulfometuron have also exhibited R/S>100. However, moderate and variable resistance (4- to 48-fold) to herbicides from other ALS-inhibiting groups, i.e. imazethapyr, flumetsulam, pyrithiobac-Na and propoxycarbone-Na. The results confirm that resistance to ALS inhibiting herbicides in C. coronarium is due to an alteration in the target site (ALS) and associated with the substitutions in the proline197 to the ALS gene..

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