INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT MEADOW BROME
(Bromus commutatus)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United Kingdom
INTRODUCTION MEADOW BROME
Meadow Brome (Bromus commutatus) is a monocot weed in the Poaceae family.  In United Kingdom this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2020 and infests Wheat.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam and they may be cross-resistant to other Group 2 (Legacy B) 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 Apr 24, 2023 )

Common NameMeadow Brome
SpeciesBromus commutatus
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesiodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam
LocationUnited Kingdom
Year2020
Situation(s)Wheat
Contributors - (Alphabetically)Laura Davies 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Meadow Brome biotype with this Meadow Brome 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 2 resistant Meadow Brome 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 2 (Legacy B) resistant Meadow Brome from United Kingdom indicate that resistance is due to an altered target site, and enhanced metabolism.  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 2 (Legacy B) resistant Meadow Brome from United Kingdom please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

LAURA DAVIES
Research Consultant
RSK ADAS Ltd
Battlegate Road
Boxworth, CB23 4NN, Cambridge
United Kingdom
Email Laura Davies

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in United Kingdom have been instrumental in providing you this information. Particular thanks is given to Laura Davies for providing detailed information.
Herbicide Resistant Meadow Brome Globally
(Bromus commutatus)
Herbicide Resistant Meadow Brome Globally
(Bromus commutatus)
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Herbicide Resistant Meadow Brome Globally
(Bromus commutatus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United KingdomUnited Kingdom 2020 Wheat iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam 44 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
357Bromus commutatusMeadow Brome25258
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, March 3, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.