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Cross-resistance of primisulfuron-resistant Bromus tectorum L. (downy brome) to sulfosulfuron

Published online by Cambridge University Press:  12 June 2017

Carol Mallory-Smith ,
Paul Hendrickson  and
George Mueller-Warrant
Paul Hendrickson
Affiliation:
Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331-3002
George Mueller-Warrant
Affiliation:
National Forage Seed Production Research Center, USDA-ARS, 3450 SW Campus Way, Corvallis, OR 97331-7102
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Extract

A Bromus tectorum L. (downy brome) biotype with cross-resistance to sulfosulfuron has been identified. The resistant biotype was selected with primisulfuron in Poa pratensis L. (Kentucky bluegrass) plots near Madras, OR. The plots received two treatments of 20 g ai ha−1 primisulfuron in the fall of 1993, 1994, and 1995. In 1995, control of B. tectorum decreased and greenhouse studies confirmed that the biotype was resistant to primisulfuron. Cross-resistance to sulfosulfuron also was confirmed in greenhouse studies. Metabolism of sulfosulfuron rather than an insensitive site of action is the likely cause of the cross-resistance.

Keywords

PrimisulfuronsulfosulfuronBromus tectorum L. BROTE, downy bromePoa pratensis L., Kentucky bluegrass.Primisulfuronsulfonylurea resistanceBROTE
Type
Rapid Publication
Information
Weed Science , Volume 47 , Issue 3 , June 1999 , pp. 256 - 257
Copyright
Copyright © 1999 by the Weed Science Society of America 

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References

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