International Survey of Herbicide-Resistant Weeds

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GROUP C1/5 RESISTANT ANNUAL FALSEBROME
(Brachypodium distachyon)


Photosystem II inhibitors (C1/5)

Israel
INTRODUCTION ANNUAL FALSEBROME
Annual Falsebrome (Brachypodium distachyon) is a monocot weed in the Poaceae family.  In Israel this weed first evolved resistance to Group C1/5 herbicides in 1975 and infests Forests, and Roadsides.   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 simazine 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 Apr 19, 2015 )

Common NameAnnual Falsebrome
SpeciesBrachypodium distachyon
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine, and simazine
LocationIsrael
Year1975
Situation(s)Forests, and Roadsides
Contributors - (Alphabetically)Maor Matzrafi, Zvi Peleg, and Baruch Rubin 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Baruch Rubin
Central part of Israel

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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Annual Falsebrome biotype with this Annual Falsebrome 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 Annual Falsebrome 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 Annual Falsebrome from Israel.
 
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CONTRIBUTING WEED SCIENTISTS

MAOR MATZRAFI
Postdoctral Researcher
University of California
Department of Plant Sciences
MS 4
Davis, 95616
Israel
Email Maor Matzrafi
ZVI PELEG
Dr.
Hebrew University of Jerusalem
Faculty of Agriculture
Food and Environment
P.O.Box 12
Rehovot, 76100
Israel
Email Zvi Peleg
Web   : Web Site Link
BARUCH RUBIN
Professor
Hebrew University Of Jerusalem
Inst. Plant Sci. & Genetics In Agriculture
Faculty Of Agric.
Food & Environm.
Rehovot, 76100, Israel
Israel
Email Baruch Rubin
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Israel have been instrumental in providing you this information. Particular thanks is given to Maor Matzrafi, Zvi Peleg, and Baruch Rubin for providing detailed information.
Herbicide Resistant Annual Falsebrome Globally
(Brachypodium distachyon)
Herbicide Resistant Annual Falsebrome Globally
(Brachypodium distachyon)
Drag a column header and drop it here to group by that column
Herbicide Resistant Annual Falsebrome Globally
(Brachypodium distachyon)
#CountryFirstYearSituationActive IngredientsSite of Action
1 IsraelIsrael 1975 Forests, and Roadsides atrazine, and simazine 23 Photosystem II inhibitors (C1/5)
35Brachypodium distachyonAnnual Falsebrome95
2 IsraelIsrael 2014 Roadsides diclofop-methyl, and pinoxaden 23 ACCase inhibitors (A/1)
35Brachypodium distachyonAnnual Falsebrome10990
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