International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Polypogon monspeliensis)

Photosystem II inhibitors (C1/5)

Rabbitfoot Polypogon (Polypogon monspeliensis) is a monocot weed in the Poaceae family.  In Israel this weed first evolved resistance to Group C1/5 herbicides in 1979 and infests 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.

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 Sep 15, 2000 )

Common NameRabbitfoot Polypogon
SpeciesPolypogon monspeliensis
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine, and simazine
Contributors - (Alphabetically)Baruch Rubin 
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Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Rabbitfoot Polypogon biotype with this Rabbitfoot Polypogon biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group C1/5 resistant Rabbitfoot Polypogon 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 Rabbitfoot Polypogon from Israel.
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Hebrew University Of Jerusalem
Inst. Plant Sci. & Genetics In Agriculture
Faculty Of Agric.
Food & Environm.
Rehovot, 76100, Israel
Email Baruch Rubin


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 Baruch Rubin for providing detailed information.
Herbicide Resistant Rabbitfoot Polypogon Globally
(Polypogon monspeliensis)
Herbicide Resistant Rabbitfoot Polypogon Globally
(Polypogon monspeliensis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Rabbitfoot Polypogon Globally
(Polypogon monspeliensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 IsraelIsrael 1979 Roadsides atrazine, and simazine 23 Photosystem II inhibitors (C1/5)
137Polypogon monspeliensisRabbitfoot Polypogon99
Literature about Similar Cases

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