International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT POLLACCI BARNYARDGRASS
(Echinochloa erecta)


Multiple Resistance: 2 Sites of Action
PSII inhibitor (Ureas and amides) (C2/7)
Cellulose inhibitors (L/26)

Italy
INTRODUCTION POLLACCI BARNYARDGRASS
Pollacci Barnyardgrass (Echinochloa erecta) is a monocot weed in the Poaceae family.  In Italy this weed first evolved multiple resistance (to 2 herbicide sites of action) in 2004 and infests Rice.  Multiple resistance has evolved to herbicides in the Groups C2/7, and L/26.  These particular biotypes are known to have resistance to propanil, and quinclorac (MOA in monocots) and they may be cross-resistant to other herbicides in the Groups C2/7, and L/26.

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 Aug 26, 2005 )

Common NamePollacci Barnyardgrass
SpeciesEchinochloa erecta
GroupPSII inhibitor (Ureas and amides) (C2/7)
Cellulose inhibitors (L/26)
Herbicidespropanil, and quinclorac (MOA in monocots)
LocationItaly
Year2004
Situation(s)Rice
Contributors - (Alphabetically)Maurizio Sattin 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Pollacci Barnyardgrass biotype with this Pollacci Barnyardgrass 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 C2, L/7, 26 resistant Pollacci Barnyardgrass 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 multiple resistant Pollacci Barnyardgrass from Italy please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MAURIZIO SATTIN
Senior Weed Scientist
Italian National Research Council (cnr)
IBAF - Weed Science Unit
Viale dell'Università 16
Legnaro, 35020, Padova
Italy
Email Maurizio Sattin

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Italy have been instrumental in providing you this information. Particular thanks is given to Maurizio Sattin for providing detailed information.
Herbicide Resistant Pollacci Barnyardgrass Globally
(Echinochloa erecta)
Herbicide Resistant Pollacci Barnyardgrass Globally
(Echinochloa erecta)
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Herbicide Resistant Pollacci Barnyardgrass Globally
(Echinochloa erecta)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ItalyItaly 2004 Rice propanil, and quinclorac (MOA in monocots) 24 Multiple Resistance: 2 Sites of Action
PSII inhibitor (Ureas and amides) (C2/7)
Cellulose inhibitors (L/26)
236Echinochloa erectaPollacci Barnyardgrass5254
2 ItalyItaly 2005 Rice propanil 24 PSII inhibitor (Ureas and amides) (C2/7)
236Echinochloa erectaPollacci Barnyardgrass8909
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, August 20, 2019 .  Available  www.weedscience.org
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