International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 5 (LEGACY C1 C2) RESISTANT SILKY WINDGRASS
(Apera spica-venti)


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

Sweden
INTRODUCTION SILKY WINDGRASS
Silky Windgrass (Apera spica-venti) is a monocot weed in the Poaceae family.  In Sweden this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 2006 and infests Winter wheat.   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 isoproturon 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 May 12, 2015 )

Common NameSilky Windgrass
SpeciesApera spica-venti
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidesisoproturon
LocationSweden
Year2006
Situation(s)Winter wheat
Contributors - (Alphabetically)Solvejg Mathiassen 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Silky Windgrass biotype with this Silky Windgrass 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 Silky Windgrass 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 Silky Windgrass from Sweden please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

SOLVEJG MATHIASSEN
Senior Scientist
Aarhus University, Science and Technology
Dept. of Agroecology
P.o. Box 30
Slagelse, 4200, Slagelse Municipality
Denmark
Email Solvejg Mathiassen

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Sweden have been instrumental in providing you this information. Particular thanks is given to Solvejg Mathiassen for providing detailed information.
Herbicide Resistant Silky Windgrass Globally
(Apera spica-venti)
Herbicide Resistant Silky Windgrass Globally
(Apera spica-venti)
Drag a column header and drop it here to group by that column
Herbicide Resistant Silky Windgrass Globally
(Apera spica-venti)
#CountryFirstYearSituationActive IngredientsSite of Action
1 AustriaAustria 2009 Cereals iodosulfuron-methyl-Na, and isoproturon 2 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
20Apera spica-ventiSilky Windgrass6746
2 BelgiumBelgium 2019 Wheat foramsulfuron, iodosulfuron-methyl-Na, and mesosulfuron-methyl 3 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass18199
3 Czech RepublicCzech Republic 2005 Cereals, and Winter wheat chlorsulfuron, iodosulfuron-methyl-Na, isoproturon, mesosulfuron-methyl, pyroxsulam, and sulfosulfuron 12 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
20Apera spica-ventiSilky Windgrass5266
4 DenmarkDenmark 2011 Winter wheat iodosulfuron-methyl-Na, and sulfosulfuron 13 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass5674
5 DenmarkDenmark 2016 Wheat fenoxaprop-ethyl, florasulam, iodosulfuron-methyl-Na, mesosulfuron-methyl, and pinoxaden 13 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass15078
6 FranceFrance 2006 Wheat iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam 17 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass9936
7 GermanyGermany 1997 Cereals, and Winter wheat isoproturon 18 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
20Apera spica-ventiSilky Windgrass5026
8 GermanyGermany 2005 Wheat chlorsulfuron, florasulam, flupyrsulfuron-methyl-Na, iodosulfuron-methyl-Na, mesosulfuron-methyl, pyroxsulam, sulfometuron-methyl, and sulfosulfuron 18 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass5526
9 GermanyGermany 2009 Spring Barley, and Winter wheat fenoxaprop-ethyl, iodosulfuron-methyl-Na, isoproturon, mesosulfuron-methyl, pinoxaden, pyroxsulam, and sulfosulfuron 18 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
20Apera spica-ventiSilky Windgrass5410
10 LatviaLatvia 2015 Wheat, and Winter wheat iodosulfuron-methyl-Na 174 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass15067
11 LithuaniaLithuania 2013 Winter wheat iodosulfuron-methyl-Na 185 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass7821
12 PolandPoland 2005 Winter wheat chlorsulfuron, iodosulfuron-methyl-Na, procarbazone-Na, and sulfosulfuron 33 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass5395
13 PolandPoland 2010 Winter wheat fenoxaprop-ethyl, and pinoxaden 33 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
20Apera spica-ventiSilky Windgrass5619
14 PolandPoland 2011 Winter wheat chlorsulfuron, fenoxaprop-ethyl, pinoxaden, sulfometuron-methyl, and sulfosulfuron 33 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass6758
15 PolandPoland 2012 Winter wheat isoproturon 33 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
20Apera spica-ventiSilky Windgrass6759
16 SwedenSweden 2006 Winter wheat isoproturon 40 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
20Apera spica-ventiSilky Windgrass10996
17 SwedenSweden 2010 Winter wheat iodosulfuron-methyl-Na, pyroxsulam, and sulfosulfuron 40 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
20Apera spica-ventiSilky Windgrass10994
18 SwitzerlandSwitzerland 1994 Wheat isoproturon 41 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
20Apera spica-ventiSilky Windgrass208
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