International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 5 (LEGACY C1 C2) RESISTANT PENNSYLVANIA SMARTWEED
(Polygonum pensylvanicum)


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

United States, Iowa
INTRODUCTION PENNSYLVANIA SMARTWEED
Pennsylvania Smartweed (Polygonum pensylvanicum) is a dicot weed in the Polygonaceae family.  In Iowa this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1990 and infests Corn (maize).   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 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 NamePennsylvania Smartweed
SpeciesPolygonum pensylvanicum
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidesatrazine
LocationUnited States, Iowa
Year1990
Situation(s)Corn (maize)
Contributors - (Alphabetically)Jack Dekker (Retired), and Micheal Owen 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Jack Dekker (Retired)
Northeast Iowa

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Laboratory trials comparing a known susceptible Pennsylvania Smartweed biotype with this Pennsylvania Smartweed 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 Pennsylvania Smartweed 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 Pennsylvania Smartweed from Iowa please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JACK DEKKER (RETIRED)
Iowa State University
Agronomy Dept.
6394 Grandview Road
Ames, 50011, Iowa
United States
Email Jack Dekker (Retired)
MICHEAL OWEN
Associate Chair And Professor
Iowa State University
Agronomy Department
3218 Agronomy Hall
Ames, 50011, Iowa
United States
Email Micheal Owen
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Iowa have been instrumental in providing you this information. Particular thanks is given to Jack Dekker (Retired), and Micheal Owen for providing detailed information.
Herbicide Resistant Pennsylvania Smartweed Globally
(Polygonum pensylvanicum)
Herbicide Resistant Pennsylvania Smartweed Globally
(Polygonum pensylvanicum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Pennsylvania Smartweed Globally
(Polygonum pensylvanicum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Iowa) United StatesIowa1990 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
135Polygonum pensylvanicumPennsylvania Smartweed240
2 United States (Arkansas) United StatesArkansas2020 Rice bispyribac-sodium, halosulfuron-methyl, and prosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
135Polygonum pensylvanicumPennsylvania Smartweed20230
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