<b>HRAC Group 5</b> <font size='2'> (Legacy C1 C2) </font> resistant Amaranthus blitum (ssp. oleraceus) from Switzerland

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 5 (LEGACY C1 C2) RESISTANT LIVID AMARANTH
(Amaranthus blitum (ssp. oleraceus))

PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

Switzerland, Valais

INTRODUCTION		LIVID AMARANTH
Livid Amaranth (Amaranthus blitum (ssp. oleraceus)) is a dicot weed in the Amaranthaceae family. In Switzerland this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1978 and infests Grapes. Group 5 (Legacy C1 C2) herbicides are known as PSII inhibitors - Serine 264 Binders (Inhbition of Photosynthesis at PSll - Serine 264 Binders ). Research has shown that these particular biotypes are resistant to simazine and they may be cross-resistant to other Group 5 (Legacy C1 C2) 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 Sep 15, 2000 )
Common Name	Livid Amaranth
Species	Amaranthus blitum (ssp. oleraceus)
Group	PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicides	simazine
Location	Switzerland, Valais
Year	1978
Situation(s)	Grapes
Contributors - (Alphabetically)	Jean Mayor
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Livid Amaranth biotype with this Livid Amaranth 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 5 resistant Livid Amaranth 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 5 (Legacy C1 C2) resistant Livid Amaranth from Switzerland please update the database.

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CONTRIBUTING WEED SCIENTISTS

JEAN MAYOR

St. Federal De Recherches, Agronomy De Changins Service De Malherbologie Weed Mgmt Program Lead - Horticulture 120 Main St, PO Box 400 Nyon, CH-1260 Switzerland

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Switzerland have been instrumental in providing you this information. Particular thanks is given to Jean Mayor for providing detailed information.

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Herbicide Resistant Livid Amaranth Globally
(Amaranthus blitum (ssp. oleraceus))

Country

FirstYear

Situation

Active Ingredients

Site of Action

France

1981

Corn (maize)

atrazine

PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)

Malaysia

1990

Vegetables

paraquat

PS I Electron Diversion ( HRAC Group 22 (Legacy D)

Switzerland

1978

Grapes

simazine

PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)

United States (New Jersey)

1993

Cabbages, Lettuce, and Onions

imazethapyr

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

Literature about Similar Cases

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Costea, M. ; Tardif, F. J.. 2003. The biology of Canadian weeds. 126. Amaranthus albus L., A. blitoides S. Watson and A. blitum L. Canadian Journal of Plant Science 83 : 1039 - 1066.

A review of biological information is provided for three species of the genus Amaranthus: A. albus, A. blitoides and A. blitum. The last species has been revised taxonomically and a new subspecies for Canada is presented - A. blitum subsp. emarginatus subsp. nov. Amaranthus albus and A. blitoides are native to the USA and introduced to Canada. Both species are annual ruderal and agrestal weeds. During the past 100 years, the two species have spread across most provinces of Canada, but the greatest frequency and abundance have been recorded in Saskatchewan. Originating from Europe, Asia and North Africa, A. blitum was initially considered a non-persistent species. The present study shows that A. blitum especially, subsp. emarginatus, has continued to spread in Québec. The three species are alternate hosts to many insects, nematodes, viruses, bacteria and fungi that affect cultivated plants. In other areas (USA, Europe and Asia), the three species have developed multiple resistance to triazine and acetolactate-synthase-inhibiting herbicides..

Bulcke, R. ; Himme, M. van. 1989. Resistance to herbicides in weeds in Belgium. : 31 - 39.

In this review of herbicide resistant weeds, estimates of occurrence in Belgium and possible control measures are presented. The first triazine-resistant biotypes of weeds were recorded 10 years ago. Resistance, at the chloroplast level, in maize crops is now widespread in Chenopodium album, Solanum nigrum and locally occurring in Epilobium ciliatum and Senecio vulgaris. In tree nurseries and fruit plantations chemical weed control measures had to be adapted to control triazine-resistant Poa annua, and has resulted in a rapid shift towards resistant biotypes of S. vulgaris, E. ciliatum and S. nigrum. Amaranthus blitum (in tree nurseries and fruit orchards) and A. bouchonii (in maize and fruit plantations) occur locally in very dense stands where s-triazines are applied but resistance has not yet been detected..

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