International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 5 (LEGACY C1 C2) RESISTANT HAIRY GALINSOGA
(Galinsoga ciliata)


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

Switzerland, Fribourg
INTRODUCTION HAIRY GALINSOGA
Hairy Galinsoga (Galinsoga ciliata) is a dicot weed in the Asteraceae family.  In Switzerland this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1991 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.

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QUIK STATS (last updated Sep 15, 2000 )

Common NameHairy Galinsoga
SpeciesGalinsoga ciliata
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidesatrazine
LocationSwitzerland, Fribourg
Year1991
Situation(s)Corn (maize)
Contributors - (Alphabetically)Jean Mayor 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Hairy Galinsoga biotype with this Hairy Galinsoga 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 Hairy Galinsoga 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 Hairy Galinsoga 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.
Herbicide Resistant Hairy Galinsoga Globally
(Galinsoga ciliata)
Herbicide Resistant Hairy Galinsoga Globally
(Galinsoga ciliata)
Drag a column header and drop it here to group by that column
Herbicide Resistant Hairy Galinsoga Globally
(Galinsoga ciliata)
#CountryFirstYearSituationActive IngredientsSite of Action
1 GermanyGermany 1980 Corn (maize) atrazine 18 PSII inhibitors - Serine 264 Binders (C1 C2/5)
92Galinsoga ciliataHairy Galinsoga441
2 SwitzerlandSwitzerland 1991 Corn (maize) atrazine 41 PSII inhibitors - Serine 264 Binders (C1 C2/5)
92Galinsoga ciliataHairy Galinsoga204
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, December 4, 2021 .  Available  www.weedscience.org
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