<b>HRAC Group 5</b> <font size='2'> (Legacy C1 C2) </font> resistant Rumex acetosella from Canada, Nova Scotia

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

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

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
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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

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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.

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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.

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Herbicide Resistant Sheep Sorrel Globally
(Rumex acetosella)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Canada (Nova Scotia)

2011

Blueberries

hexazinone

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

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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