International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP A/1 RESISTANT LITTLE SEED CANARY GRASS
(Phalaris minor)


ACCase inhibitors (A/1)

Mexico
INTRODUCTION LITTLE SEED CANARY GRASS
Little seed Canary grass (Phalaris minor) is a monocot weed in the Poaceae family.  In Mexico this weed first evolved resistance to Group A/1 herbicides in 1996 and infests Wheat.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of acetyl CoA carboxylase (ACCase)).  Research has shown that these particular biotypes are resistant to clodinafop-propargyl, fenoxaprop-P-ethyl, fluazifop-P-butyl, pinoxaden, sethoxydim, and tralkoxydim and they may be cross-resistant to other Group A/1 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 18, 2012 )

Common NameLittle seed Canary grass
SpeciesPhalaris minor
GroupACCase inhibitors (A/1)
Herbicidesclodinafop-propargyl, fenoxaprop-P-ethyl, fluazifop-P-butyl, pinoxaden, sethoxydim, and tralkoxydim
LocationMexico
Year1996
Situation(s)Wheat
Contributors - (Alphabetically)Ken Sayre, and J. Antonio Tafoya-Razo 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Ken Sayre
Irrigated wheat production areas in central highlands in the states of Guanajuato and Michoacan (Fairly widely reported).

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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Little seed Canary grass biotype with this Little seed Canary grass 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 A/1 resistant Little seed Canary grass 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 A/1 resistant Little seed Canary grass from Mexico please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

KEN SAYRE
Cimmyt
International
International Maize And Wheat Improvement Cen
Weed Science Bldg 258
PO Box 110505,
Mexico, CP 06600
Mexico
J. ANTONIO TAFOYA-RAZO
Proffesor-Researcher
Universidad Autónoma Chapingo
Parasitología Agrícola
Ariel Rios Building
Mail Code:7505P, 1200 Pennsylvania Avenue, N. W.
Chapingo, 56230, México
Mexico
Email J. Antonio Tafoya-Razo

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Mexico have been instrumental in providing you this information. Particular thanks is given to Ken Sayre, and J. Antonio Tafoya-Razo for providing detailed information.
Herbicide Resistant Little seed Canary grass Globally
(Phalaris minor)
Herbicide Resistant Little seed Canary grass Globally
(Phalaris minor)
Drag a column header and drop it here to group by that column
Herbicide Resistant Little seed Canary grass Globally
(Phalaris minor)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Victoria) AustraliaVictoria2012 Wheat clodinafop-propargyl 1 ACCase inhibitors (A/1)
127Phalaris minorLittle seed Canary grass7838
2 IndiaIndia 1991 Wheat isoproturon 21 PSII inhibitor (Ureas and amides) (C2/7)
127Phalaris minorLittle seed Canary grass222
3 IndiaIndia 1994 Wheat diclofop-methyl, and pinoxaden 21 ACCase inhibitors (A/1)
127Phalaris minorLittle seed Canary grass7815
4 IndiaIndia 2006 Wheat clodinafop-propargyl, fenoxaprop-P-ethyl, isoproturon, mesosulfuron-methyl, pinoxaden, pyroxsulam, and sulfosulfuron 21 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
PSII inhibitor (Ureas and amides) (C2/7)
127Phalaris minorLittle seed Canary grass5324
5 IndiaIndia 2013 Wheat iodosulfuron-methyl-sodium, and mesosulfuron-methyl 21 ALS inhibitors (B/2)
127Phalaris minorLittle seed Canary grass7816
6 IranIran 2004 Winter wheat clodinafop-propargyl, diclofop-methyl, fenoxaprop-P-ethyl, pinoxaden, and tralkoxydim 79 ACCase inhibitors (A/1)
127Phalaris minorLittle seed Canary grass5377
7 IsraelIsrael 1993 Wheat fenoxaprop-P-ethyl 23 ACCase inhibitors (A/1)
127Phalaris minorLittle seed Canary grass111
8 MexicoMexico 1996 Wheat clodinafop-propargyl, fenoxaprop-P-ethyl, fluazifop-P-butyl, pinoxaden, sethoxydim, and tralkoxydim 29 ACCase inhibitors (A/1)
127Phalaris minorLittle seed Canary grass478
9 South AfricaSouth Africa 1999 Pastures, and Wheat clodinafop-propargyl, diclofop-methyl, fenoxaprop-P-ethyl, haloxyfop-P-methyl, iodosulfuron-methyl-sodium, mesosulfuron-methyl, propaquizafop, quizalofop-P-tefuryl, and sulfosulfuron 37 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
127Phalaris minorLittle seed Canary grass5194
10 United States (California) United StatesCalifornia2001 Onions clethodim, fenoxaprop-P-ethyl, fluazifop-P-butyl, and sethoxydim 45 ACCase inhibitors (A/1)
127Phalaris minorLittle seed Canary grass5163
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