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Agronomy 2013, 3(2), 340-348; doi:10.3390/agronomy3020340
Article

Downy Brome (Bromus tectorum L.) and Broadleaf Weed Control in Winter Wheat with Acetolactate Synthase-Inhibiting Herbicides

* ,
 and
Agricultural Research Center, Kansas State University, Hays, KS 67601, USA
* Author to whom correspondence should be addressed.
Received: 26 December 2012 / Revised: 30 March 2013 / Accepted: 7 April 2013 / Published: 18 April 2013
(This article belongs to the Special Issue Weed Management and Herbicide Resistance)
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Abstract

A study was conducted for three seasons in northwest Kansas, USA to evaluate acetolactate synthase (ALS)-inhibiting herbicides for downy brome (Bromus tectorum L.) and winter annual broadleaf weed control in winter wheat. Herbicides included pyroxsulam at 18.4 g ai ha−1, propoxycarbazone-Na at 44 g ai ha−1, premixed propoxycarbazone-Na & mesosulfuron-methyl at 27 g ai ha−1, and sulfosulfuron at 35 g ai ha−1. The herbicides were applied postemergence in fall and spring seasons. Averaged over time of application, no herbicide controlled downy brome more than 78% in any year. When downy brome densities were high, control was less than 60%. Pyroxsulam controlled downy brome greater than or similar to other herbicides tested. Flixweed (Descurainia sophia L.), blue mustard [Chorispora tenella (Pallas) DC.], and henbit (Lamium amplexicaule L.) control did not differ among herbicide treatments. All herbicides tested controlled flixweed and blue mustard at least 87% and 94%, respectively. However, none of the herbicides controlled henbit more than 73%. Fall herbicide applications improved weed control compared to early spring applications; improvement ranged from 3% to 31% depending on the weed species. Henbit control was greatly decreased by delaying herbicide applications until spring compared to fall applications (49% vs. 80% control). Herbicide injury was observed in only two instances. The injury was ≤13% with no difference between herbicides and the injury did not impact final plant height or grain yield.
Keywords: blue mustard; downy brome; flixweed; henbit; propoxycarbazone-Na; pyroxsulam; sulfosulfuron blue mustard; downy brome; flixweed; henbit; propoxycarbazone-Na; pyroxsulam; sulfosulfuron
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Reddy, S.S.; Stahlman, P.W.; Geier, P.W. Downy Brome (Bromus tectorum L.) and Broadleaf Weed Control in Winter Wheat with Acetolactate Synthase-Inhibiting Herbicides. Agronomy 2013, 3, 340-348.

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