<b>HRAC Group 5</b> <font size='2'> (Legacy C1 C2) </font> resistant Chenopodium polyspermum from Switzerland

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 5 (LEGACY C1 C2) RESISTANT MANYSEEDED GOOSEFOOT
(Chenopodium polyspermum)

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

Switzerland, Vaud

INTRODUCTION		MANYSEEDED GOOSEFOOT
Manyseeded Goosefoot (Chenopodium polyspermum) is a dicot weed in the Chenopodiaceae family. In Switzerland this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1982 and infests Corn (maize). 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 atrazine 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	Manyseeded Goosefoot
Species	Chenopodium polyspermum
Group	PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicides	atrazine
Location	Switzerland, Vaud
Year	1982
Situation(s)	Corn (maize)
Contributors - (Alphabetically)	Jean Mayor
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Laboratory trials comparing a known susceptible Manyseeded Goosefoot biotype with this Manyseeded Goosefoot 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 Manyseeded Goosefoot 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 Manyseeded Goosefoot 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 Manyseeded Goosefoot Globally
(Chenopodium polyspermum)

Country

FirstYear

Situation

Active Ingredients

Site of Action

France

1980

Corn (maize), and Cropland

atrazine

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

Germany

1988

Corn (maize)

atrazine

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

Switzerland

1982

Corn (maize)

atrazine

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

Literature about Similar Cases

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Netland, J.. 1996. Weed species and frequency of simazine-resistant populations of Poa annua and Senecio vulgaris in nursery stocks imported to Norway or inland-raised. : 461 - 468.

A survey was carried out during 1994 in Norway of weeds found in imported or inland-raised nursery stocks, with special emphasis on triazine resistance of Poa annua and Senecio vulgaris. In 45 imported and 52 inland-raised samples, 58 and 45 weed species were found, respectively. Uncommon species in inland nurseries were Chenopodium polyspermum, Chamomilla recutita, Solanum nigrum, Polygonum hydropiper, Eupatorium cannabinum, Catabrosa aquatica, Oxalis corniculata, Alchemilla arvensis, Hydrocotyle vulgaris, Epilobium hirsutum, Ranunculus sceleratus and Apera spica-venti. More species and a greater number of weeds were found in balled plants than in container plants. No difference was recorded in the number of weeds between the imported and inland-raised nursery stocks. Triazine resistance in S. vulgaris was found in 8 out of 8 imported samples, compared to only one sample out of 8 of the inland-raised stocks. The corresponding counts for P. annua were 3 out of 22 and 0 out of 14, respectively..

Kees, H.. 1988. The development of triazine-resistant annual weeds in Bavaria and experience with their control. Gesunde Pflanzen 40 : 407 - 412, 414.

The first evidence of weed resistance to triazine herbicides in Bavaria occurred in the period 1975-80 in intensive maize growing areas following continuous treatment with atrazine. Resistance was shown by Stellaria media, Solanum nigrum, Chenopodium album and Galinsoga ciliata, with Atriplex patula and C. ficifolium being largely unaffected. Since 1982 there has been a sharp increase in the areas affected by resistant species which included for the first time Amaranthus retroflexus, Senecio vulgaris and, in isolated instances, C. polyspermum; Polygonum lapathifolium, Fallopia convoluulus, and Epilobium tetragonum also showed resistance. Since 1980, triazine-resistance has also been reported in S. vulgaris, Poa annua, C. album and A. retroflexus in horticultural crops. Control strategies to combat weed resistance are discussed..

Gasquez, J. ; Compoint, J. P.. 1980. Three new atrazine-resistant weeds in France: Amaranthus retroflexus s.l., Chenopodium polyspermum L., Polygonum persicaria L. Chemosphere 9 : 39 - 43.

Atrazine-resistant populations of A. retroflexus, C. polyspermum and P. persicaria are described. The behaviour of resistant amaranths suggests that they are hybrids between two closely related species. Resistance was tested by treating seedlings, by observation of fluorescence in whole leaves and measurement of the activity of isolated chloroplasts. Observation of fluorescence showed that these populations were resistant to other triazines..

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