International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP D/22 RESISTANT SQUIRRELTAIL FESCUE
(Vulpia bromoides)


PSI Electron Diverter (D/22)

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 D/22 herbicides in 1990 and infests Alfalfa.   Group D/22 herbicides are known as PSI Electron Diverter (Photosystem-I-electron diversion).  Research has shown that these particular biotypes are resistant to diquat, and paraquat and they may be cross-resistant to other Group D/22 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 Jun 06, 2000 )

Common NameSquirreltail Fescue
SpeciesVulpia bromoides
GroupPSI Electron Diverter (D/22)
Herbicidesdiquat, and paraquat
LocationAustralia, Victoria
Year1990
Situation(s)Alfalfa
Contributors - (Alphabetically)Christopher Preston 
Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Christopher Preston
Victoria.

Edit this Note  |  Add New Note
 
GENERAL

Christopher Preston
Also resistant to diquat.

Edit this Note  |  Add New Note
 

ACADEMIC ASPECTS

Confirmation Tests

Greenhouse 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 Group D/22 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 D/22 resistant Squirreltail Fescue from Victoria please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

CHRISTOPHER PRESTON
University Of Adelaide - Waite Campus
Crc For Australian Weed Management And School Of Agriculture
Box 2146
Adelaide, 5064, South Australia
Australia
Email Christopher Preston

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 Christopher Preston 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 PSI Electron Diverter (D/22)
173Vulpia bromoidesSquirreltail Fescue17
2 Australia (Victoria) AustraliaVictoria2009 Pastures simazine 1 Photosystem II inhibitors (C1/5)
173Vulpia bromoidesSquirreltail Fescue7841
3 Australia (Western Australia) AustraliaWestern Australia2014 Pastures simazine 1 Photosystem II inhibitors (C1/5)
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.  Tuesday, November 12, 2019 .  Available  www.weedscience.org
Copyright © 1993- 2019 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.