International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT LATEFLOWERING GOOSEFOOT
(Chenopodium album var. striatum (=C. strictum var. glaucophyllum))


Photosystem II inhibitors (C1/5)

Canada, Ontario
INTRODUCTION LATEFLOWERING GOOSEFOOT
Lateflowering Goosefoot (Chenopodium album var. striatum (=C. strictum var. glaucophyllum)) is a dicot weed in the Chenopodiaceae family.  In Ontario this weed first evolved resistance to Group C1/5 herbicides in 1976 and infests Corn (maize), and Cropland.   Group C1/5 herbicides are known as Photosystem II inhibitors (Inhibition of photosynthesis at photosystem II).  Research has shown that these particular biotypes are resistant to atrazine and they may be cross-resistant to other Group C1/5 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 Dec 28, 2000 )

Common NameLateflowering Goosefoot
SpeciesChenopodium album var. striatum (=C. strictum var. glaucophyllum)
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationCanada, Ontario
Year1976
Situation(s)Corn (maize), and Cropland
Contributors - (Alphabetically)Clarence Swanton 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Clarence Swanton
Brant county

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GENERAL

Hugh Beckie
S. I. Warwick, V. Souza Machado, P. B. Marriage, and J. D. Bandeen. 1979. Resistance of Chenopodium strictum Roth (Late-Flowering Goosefoot) to atrazine. Can. J. Plant Sci. 59:269-270. Also: S. I. Warwick and L. Black. 1981. The relative competitiveness of atrazine susceptible and resistant populations of Chenopodium album and C. strictum. Can. J. Bot. 59:689-693.

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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Lateflowering Goosefoot biotype with this Lateflowering 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 Group C1/5 resistant Lateflowering 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

Triazine resistant weeds often exhibit a lower relative fitness when compared to susceptible biotypes.  The most common mutation conferring triazine resistance (Ser 264 to Gly mutation of the psbA gene) also causes a reduction in CO2 fixation, quantum yield, and seed and biomass production.  There is no record in this database referring specifically to fitness studies on Group C1/5 resistant Lateflowering Goosefoot from Ontario.
 
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CONTRIBUTING WEED SCIENTISTS

CLARENCE SWANTON
University Of Guelph
Dept. Of Crop Science
Ontario Agricultural College
PO Box 249
Guelph, N1G 2W1, Ontario
Canada
Email Clarence Swanton

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Ontario have been instrumental in providing you this information. Particular thanks is given to Clarence Swanton for providing detailed information.
Herbicide Resistant Lateflowering Goosefoot Globally
(Chenopodium album var. striatum (=C. strictum var. glaucophyllum))
Herbicide Resistant Lateflowering Goosefoot Globally
(Chenopodium album var. striatum (=C. strictum var. glaucophyllum))
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Herbicide Resistant Lateflowering Goosefoot Globally
(Chenopodium album var. striatum (=C. strictum var. glaucophyllum))
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario1976 Corn (maize), and Cropland atrazine 7 Photosystem II inhibitors (C1/5)
51Chenopodium album var. striatum (=C. strictum var. glaucophyllum)Lateflowering Goosefoot60
2 Czech RepublicCzech Republic 1989 Corn (maize), and Sugar beets atrazine, lenacil, prometryn, simazine, and terbutryn 12 Photosystem II inhibitors (C1/5)
51Chenopodium album var. striatum (=C. strictum var. glaucophyllum)Lateflowering Goosefoot79
3 United States (Michigan) United StatesMichigan2004 Corn (maize), and Soybean atrazine 45 Photosystem II inhibitors (C1/5)
51Chenopodium album var. striatum (=C. strictum var. glaucophyllum)Lateflowering Goosefoot5288
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, October 20, 2017 .  Available  www.weedscience.org
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