International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 5 (LEGACY C1 C2) RESISTANT SWAMP PRICKLEGRASS
(Crypsis schoenoides)

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

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 5 (Legacy C1 C2) herbicides in 1995 and infests Forests.   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 atrazine, and 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.

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QUIK STATS (last updated Sep 15, 2000 )

Common NameSwamp Pricklegrass
SpeciesCrypsis schoenoides
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
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 HRAC Group 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

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 Swamp Pricklegrass from Israel please update the database.
 
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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)
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Herbicide Resistant Swamp Pricklegrass Globally
(Crypsis schoenoides)
#CountryFirstYearSituationActive IngredientsSite of Action
1 IsraelIsrael 1995 Forests atrazine, and simazine 23 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
 		67Crypsis schoenoidesSwamp Pricklegrass105
Literature about Similar Cases

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