International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT SWAMP PRICKLEGRASS
(Crypsis schoenoides)


Photosystem II inhibitors (C1/5)

Israel
INTRODUCTION SWAMP PRICKLEGRASS
Swamp Pricklegrass (Crypsis schoenoides) is a monocot weed in the Poaceae family.  In Israel this weed first evolved resistance to Group C1/5 herbicides in 1995 and infests Forests.   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 Sep 15, 2000 )

Common NameSwamp Pricklegrass
SpeciesCrypsis schoenoides
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine, and simazine
LocationIsrael
Year1995
Situation(s)Forests
Contributors - (Alphabetically)Baruch Rubin 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Baruch Rubin
One county, two locations.

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GENERAL

Baruch Rubin
Just found this species and will be working on it. This species may have SU resistance as well.

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ACADEMIC ASPECTS

Confirmation Tests

Laboratory trials comparing a known susceptible Swamp Pricklegrass biotype with this Swamp Pricklegrass 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 Swamp Pricklegrass 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 Swamp Pricklegrass from Israel.
 
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CONTRIBUTING WEED SCIENTISTS

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

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 Baruch Rubin for providing detailed information.
Herbicide Resistant Swamp Pricklegrass Globally
(Crypsis schoenoides)
Herbicide Resistant Swamp Pricklegrass Globally
(Crypsis schoenoides)
Drag a column header and drop it here to group by that column
Herbicide Resistant Swamp Pricklegrass Globally
(Crypsis schoenoides)
#CountryFirstYearSituationActive IngredientsSite of Action
1 IsraelIsrael 1995 Forests atrazine, and simazine 23 Photosystem II inhibitors (C1/5)
67Crypsis schoenoidesSwamp Pricklegrass105
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, December 6, 2019 .  Available  www.weedscience.org
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