<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Bromus commutatus from United Kingdom

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.

QUIK STATS (last updated Apr 24, 2023 )
Common Name	Meadow Brome
Species	Bromus commutatus
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam
Location	United Kingdom
Year	2020
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.

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Herbicide Resistant Meadow Brome Globally
(Bromus commutatus)

Country

FirstYear

Situation

Active Ingredients

Site of Action

United Kingdom

2020

Wheat

iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam

Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)

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Heap, I. The International Herbicide-Resistant Weed Database. Online. Thursday, April 18, 2024 . Available www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.