Herbicide Resistant Weeds

GROUP B/2 RESISTANT BUSHY WALLFLOWER (Erysimum repandum)
USA: Kansas

Thursday, September 09, 2010

What's on this page

Bushy Wallflower

1.	Introduction
2.	Level of Infestation
3.	Quick Statistics
4.	Notes about this biotype
5.	Academic Aspects
6.	R Bushy Wallflower Globally
7.	Fact Sheets and Literature
8.	Contributing Weed Scientists
9.	Acknowledgements
10.	Where to now?

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Introduction

Level of Infestation

Bushy Wallflower (Erysimum repandum) is a dicot weed in the Brassicaceae family. In Kansas this weed first evolved resistance to Group B/2 herbicides in 2005 and infests winter wheat. Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)). Research has shown that these particular biotypes are resistant to chlorsulfuron, imazamox, metsulfuron-methyl, propoxycarbazone, sulfosulfuron, triasulfuron, and tribenuron-methyl and they may be cross-resistant to other Group B/2 herbicides.

Local weed scientists estimate that Group B/2 resistant Bushy Wallflower in Kansas infests 11-50 sites and the number of sites are increasing. They also estimate that there are 1001-10000 acres infested with Group B/2 resistant Bushy Wallflower and the area infested is increasing.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their mode of action. To see a full list of herbicides and HRAC herbicide classifications click here.

QUIK STATS ( last updated Nov 30, 2009 )
Common Name	Bushy Wallflower
Species	Erysimum repandum
Group	ALS inhibitors (B/2)
Herbicides	chlorsulfuron, imazamox, metsulfuron-methyl, propoxycarbazone, sulfosulfuron, triasulfuron, and tribenuron-methyl
Location	USA, Kansas
Year	2005
Situation(s)	winter wheat
Sites	11-50
Acres Infested	1001-10000
Contributors	Dallas Peterson
Input Data	Edit this Case \| Add New Case of Resistance \| Add Note

ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Bushy Wallflower biotype with this Bushy Wallflower 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

The genetic basis of resistance for this biotype is either unknown or has not been entered in the database. If you know anything about the genetic inheritance of this biotype please update the database.

Mechanism of Resistance

Studies on the mechanism of resistance of Group B/2 resistant Bushy Wallflower from Kansas 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 B/2 resistant Bushy Wallflower from Kansas please update the database.

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HERBICIDE RESISTANT BUSHY WALLFLOWER GLOBALLY
#	Country	Year	Sites	Acres	Mode of Action
1.	USA (Kansas)	2005	11-50	1001-10000	ALS inhibitors (B/2)

FACT SHEETS AND OTHER LITERATURE	Format
At Present there are no articles on this case of resistance. Please help by adding an article.
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CONTRIBUTING WEED SCIENTISTS

DALLAS PETERSON	Edit
Kansas State University Agronomy Department Throckmorton Hall Manhattan, 66506, Kansas USA Email Dallas Peterson

Acknowledgements

Where to now?

The Herbicide Resistance Action Committee, The North American Herbicide Resistance Action Committee, the Weed Science Society of America, and weed scientists in Kansas have been instrumental in providing you this information. Particular thanks is given to Dallas Peterson for providing detailed information.

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5.	Resistant weeds in Kansas
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