HRAC GROUP 5 (LEGACY C1 C2) RESISTANT SHEEP SORREL
(Rumex acetosella)

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

Canada, Nova Scotia

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INTRODUCTION SHEEP SORREL Sheep Sorrel (Rumex acetosella) is a dicot weed in the Polygonaceae family.  In Nova Scotia this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 2011 and infests Blueberries.   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 hexazinone 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.

QUIK STATS (last updated Jan 27, 2016 ) Common Name Sheep Sorrel Species Rumex acetosella Group PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2) Herbicides hexazinone Location Canada, Nova Scotia Year 2011 Situation(s) Blueberries Contributors - (Alphabetically) Francois Tardif  Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE GENERAL Francois Tardif Hexazinone Resistance in Red Sorrel (Rumex acetosella) Author(s): Zhenyi Li, Nathan Boyd, Nancy McLean, and Katherine Rutherford Source: Weed Science, 62(3):532-537. Zhenyi Li was the M Sc student and Nathan Boyd the supervisor. nsboyd@ufl.edu Seed was collected at four sites in Nova Scotia in 2011 Edit this Note  |  Add New Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse, and Laboratory trials comparing a known susceptible Sheep Sorrel biotype with this Sheep Sorrel 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 Sheep Sorrel 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 Sheep Sorrel from Nova Scotia 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 Sheep Sorrel from Nova Scotia please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS FRANCOIS TARDIF Associate Professor University Of Guelph Department Of Plant Agriculture 2055 Radatz Ave Guelph, N1G 2W1, Ontario Canada Email Francois Tardif Web   : Web Site Link

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Nova Scotia have been instrumental in providing you this information. Particular thanks is given to Francois Tardif for providing detailed information.

Herbicide Resistant Sheep Sorrel Globally (Rumex acetosella) Herbicide Resistant Sheep Sorrel Globally (Rumex acetosella) Drag a column header and drop it here to group by that column Herbicide Resistant Sheep Sorrel Globally (Rumex acetosella) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Canada (Nova Scotia) Canada Nova Scotia 2011 Blueberries hexazinone 7 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2) 337 Rumex acetosella Sheep Sorrel 17122

Literature about Similar Cases

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Thomas, A. G. ; Doohan, D. J. ; McCully, K. V.. 1994. Weed survey of spring cereals in New Brunswick. Phytoprotection 75 : 113 - 124.

During 1986 and 1987, a weed survey of 187 New Brunswick cereal fields was conducted. A total of 76 species were identified, of which 40 were considered agronomically important. About 50% of the species were perennial. Hemp-nettle (Galeopsis tetrahit), quack grass (Agropyron repens [Elymus repens]), sheep sorrel (Rumex acetosella), ox-eye daisy (Chrysanthemum leucanthemum [Leucanthemum vulgare]), corn spury (Spergula arvensis) and chickweed (Stellaria media) had the highest relative abundance values. Quack grass and hemp-nettle had the highest densities at 8.0 and 7.1 plants m^-2, respectively. The highest weed density (103 plants m^-2) was found in oats (Avena sativa) grown after a forage crop. The lowest density (24 plants m^-2) was found in wheat (Triticum aestivum) grown after potatoes (Solanum tuberosum). Most of the abundant species were tolerant to MCPA, the most commonly used herbicide. It was concluded that farmers could make major improvements in cereal weed control by choosing a herbicide that would control species tolerant to MCPA or 2,4-D, and using preplant or postharvest weed control to minimize the impact of perennial weeds..

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