International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 5 (LEGACY C1 C2) RESISTANT SQUIRRELTAIL FESCUE
(Vulpia bromoides)


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

Australia, Victoria
INTRODUCTION SQUIRRELTAIL FESCUE
Squirreltail Fescue (Vulpia bromoides) is a monocot weed in the Poaceae family.  In Victoria this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 2009 and infests Pastures.   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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Jan 22, 2014 )

Common NameSquirreltail Fescue
SpeciesVulpia bromoides
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidessimazine
LocationAustralia, Victoria
Year2009
Situation(s)Pastures
Contributors - (Alphabetically)Peter Boutsalis 
Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Squirreltail Fescue biotype with this Squirreltail Fescue 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 Squirreltail Fescue 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 Squirreltail Fescue from Victoria please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

PETER BOUTSALIS
Postdoctural Fellow/ Consultant
University Of Adelaide / Plant Science Consulting
Plant And Pest Science
800 N Lindbergh Blvd
02G
Adelaide, 5064, South Australia
Australia
Email Peter Boutsalis

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Victoria have been instrumental in providing you this information. Particular thanks is given to Peter Boutsalis for providing detailed information.
Herbicide Resistant Squirreltail Fescue Globally
(Vulpia bromoides)
Herbicide Resistant Squirreltail Fescue Globally
(Vulpia bromoides)
Drag a column header and drop it here to group by that column
Herbicide Resistant Squirreltail Fescue Globally
(Vulpia bromoides)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Victoria) AustraliaVictoria1990 Alfalfa diquat, and paraquat 1 PS I Electron Diversion (D/22)
173Vulpia bromoidesSquirreltail Fescue17
2 Australia (Victoria) AustraliaVictoria2009 Pastures simazine 1 PSII inhibitors - Serine 264 Binders (C1 C2/5)
173Vulpia bromoidesSquirreltail Fescue7841
3 Australia (Western Australia) AustraliaWestern Australia2014 Pastures simazine 1 PSII inhibitors - Serine 264 Binders (C1 C2/5)
173Vulpia bromoidesSquirreltail Fescue11030
Literature about Similar Cases

1
Page size:
select
Page: of 1
Items 1 to 2 of 2

1
Page size:
select
Page: of 1
Items 1 to 2 of 2
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Sunday, December 5, 2021 .  Available  www.weedscience.org
Copyright © 1993- 2021 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.