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Downy Brome (Bromus tectorum) Response to Imazamox Rate and Application Timing in Herbicide-Resistant Winter Wheat

Published online by Cambridge University Press:  20 January 2017

Robert N. Stougaard ,
Carol A. Mallory-Smith  and
James A. Mickelson
Robert N. Stougaard*
Affiliation:
Montana State University, Northwestern Agricultural Research Center, Kalispell, MT 59901
Carol A. Mallory-Smith
Affiliation:
Oregon State University, Corvallis, OR, 97331-3002
James A. Mickelson
Affiliation:
Montana State University, Southern Agricultural Research Center, Huntley, MT, 59037
*
Corresponding author's E-mail: rns@montana.edu
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Abstract

Field experiments were conducted at Kalispell, MT, and Corvallis, OR, to determine the optimum rate and application timing of imazamox for downy brome control in winter wheat. Crop injury occurred as a reduction in plant height and was minimal at Kalispell, never exceeding 10%. Crop injury at Corvallis was more severe and was dependant on application timing. No injury was observed with spring applications, but fall applications resulted in as much as 33% injury at the highest rate of imazamox. Fall applications generally provided more consistent control of downy brome, as evidenced by the lower dosage required to reduce downy brome dry weight by 50% (lower I50 values). Nonetheless, spring applications generally provided control comparable with that of fall applications when imazamox was applied at the highest rate. The one exception was at Corvallis during 1997 to 1998, where spring applications failed to provide adequate control of downy brome even at the highest rate applied. Although imazamox generally provided excellent control of downy brome, wheat yield response to downy brome interference was negligible, declining by less than 10% in the absence of imazamox. The absence of a yield response to downy brome interference was attributed to the lack of competition for soil moisture from downy brome under the high-rainfall conditions of the experiment.

Keywords

Imazamoxdowny brome, Bromus tectorum L. #3 BROTEwinter wheat, Triticum aestivum L.Dose–responsereduced rates.
Type
Research
Information
Weed Technology , Volume 18 , Issue 4 , December 2004 , pp. 1043 - 1048
Copyright
Copyright © Weed Science Society of America 

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