International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 22 (LEGACY D) RESISTANT PENNSYLVANIA EVERLASTING
(Gamochaeta pensylvanica)

PS I Electron Diversion HRAC Group 22 (Legacy D)

Australia, Queensland
INTRODUCTION PENNSYLVANIA EVERLASTING
Pennsylvania Everlasting (Gamochaeta pensylvanica) is a dicot weed in the Asteraceae family.  In Queensland this weed first evolved resistance to Group 22 (Legacy D) herbicides in 2015 and infests Sugarcane for sugar, and Vegetables.   Group 22 (Legacy D) herbicides are known as PS I Electron Diversion (PSI Electron Diversion ).  Research has shown that these particular biotypes are resistant to paraquat and they may be cross-resistant to other Group 22 (Legacy D) 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 Feb 08, 2016 )

Common NamePennsylvania Everlasting
SpeciesGamochaeta pensylvanica
GroupPS I Electron Diversion HRAC Group 22 (Legacy D)
Herbicidesparaquat
LocationAustralia, Queensland
Year2015
Situation(s)Sugarcane for sugar, and Vegetables
Contributors - (Alphabetically)Christopher Preston 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Pennsylvania Everlasting biotype with this Pennsylvania Everlasting 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 22 resistant Pennsylvania Everlasting 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 22 (Legacy D) resistant Pennsylvania Everlasting from Queensland please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CHRISTOPHER PRESTON
University Of Adelaide - Waite Campus
Crc For Australian Weed Management And School Of Agriculture
Box 2146
Adelaide, 5064, South Australia
Australia
Email Christopher Preston

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Queensland have been instrumental in providing you this information. Particular thanks is given to Christopher Preston for providing detailed information.
Herbicide Resistant Pennsylvania Everlasting Globally
(Gamochaeta pensylvanica)
Herbicide Resistant Pennsylvania Everlasting Globally
(Gamochaeta pensylvanica)
Drag a column header and drop it here to group by that column
Herbicide Resistant Pennsylvania Everlasting Globally
(Gamochaeta pensylvanica)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Queensland) AustraliaQueensland2015 Sugarcane for sugar, and Vegetables paraquat 1 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
 		298Gamochaeta pensylvanicaPennsylvania Everlasting11029
2 JapanJapan 1991 Mulberry paraquat 25 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
 		298Gamochaeta pensylvanicaPennsylvania Everlasting7789
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