International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 5 (LEGACY C1 C2) RESISTANT COMMON PURSLANE
(Portulaca oleracea)


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

United States, Michigan
INTRODUCTION COMMON PURSLANE
Common Purslane (Portulaca oleracea) is a dicot weed in the Portulacaceae family.  In Michigan this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1991 and infests Carrots, and Vegetables.   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 linuron 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 Mar 05, 2007 )

Common NameCommon Purslane
SpeciesPortulaca oleracea
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidesatrazine, and linuron
LocationUnited States, Michigan
Year1991
Situation(s)Carrots, and Vegetables
Contributors - (Alphabetically)Steven Gower, Joseph G. Masabni, and Bernard Zandstra 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Bernard Zandstra
Lapeer county, 1 mile north of Imlay City, Brandt Farms, SE of packingshed near pond.

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GENERAL

Bernard Zandstra
The resistant common purslane is concentrated at the end of the rows where linuron would be concentrated by boom overlap and final passes. This biotype is immune to atrazine with no reaction to over 200 kg/ha.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Common Purslane biotype with this Common Purslane 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 Common Purslane 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 Common Purslane from Michigan please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

STEVEN GOWER
Former Weed Science Diagnostician (Now with Monsanto)
Michigan State University
Diagnostic Services
578 Wilson Rd.
East Lansing, 48824, Michigan
United States
Email Steven Gower
JOSEPH G. MASABNI
Extension Vegetable Specialist
Texas A&M University
Department of Horticultural Sciences
2134 TAMU
College Station, 77843-2133, Texas
United States
Email Joseph G. Masabni
Web   : Web Site Link
BERNARD ZANDSTRA
Professor
Michigan State University
Department of Horticulture
A440 Plant & Soil Sciences Building 1066 Bogue Street
East Lansing, 48824-1325, Michigan
United States
Email Bernard Zandstra
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Michigan have been instrumental in providing you this information. Particular thanks is given to Steven Gower, Joseph G. Masabni, and Bernard Zandstra for providing detailed information.
Herbicide Resistant Common Purslane Globally
(Portulaca oleracea)
Herbicide Resistant Common Purslane Globally
(Portulaca oleracea)
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Herbicide Resistant Common Purslane Globally
(Portulaca oleracea)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Michigan) United StatesMichigan1991 Carrots, and Vegetables atrazine, and linuron 45 Multiple Resistance: 2 Sites of Action
PSII inhibitors - Serine 264 Binders (C1 C2/5)
PSII inhibitors - Serine 264 Binders (C1 C2/7)
138Portulaca oleraceaCommon Purslane378
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