International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 5 (LEGACY C1 C2) RESISTANT BURNING NETTLE
(Urtica urens)


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

Australia, Victoria
INTRODUCTION BURNING NETTLE
Burning Nettle (Urtica urens) is a dicot weed in the Urticaceae family.  In Victoria this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 2002 and infests 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, prometryne, and simazine 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 Jul 23, 2003 )

Common NameBurning Nettle
SpeciesUrtica urens
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidesatrazine, prometryne, and simazine
LocationAustralia, Victoria
Year2002
Situation(s)Vegetables
Contributors - (Alphabetically)Christopher Preston 
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NOTES ABOUT THIS BIOTYPE

FIELD HISTORIES

Christopher Preston
The resistance occurred in a celery crop after 26 years of prometryn use.

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MECHANISM

Christopher Preston
Target site resistance. This biotype has > 100 fold resistance to atrazine and simazine.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Burning Nettle biotype with this Burning Nettle 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 Burning Nettle 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

Studies on the mechanism of resistance of Group 5 (Legacy C1 C2) resistant Burning Nettle from Victoria indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Burning Nettle from Victoria 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 Victoria have been instrumental in providing you this information. Particular thanks is given to Christopher Preston for providing detailed information.
Herbicide Resistant Burning Nettle Globally
(Urtica urens)
Herbicide Resistant Burning Nettle Globally
(Urtica urens)
Drag a column header and drop it here to group by that column
Herbicide Resistant Burning Nettle Globally
(Urtica urens)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Victoria) AustraliaVictoria2002 Vegetables atrazine, prometryne, and simazine 1 PSII inhibitors - Serine 264 Binders (C1 C2/5)
222Urtica urensBurning Nettle5190
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