Abstract
Winter wheat ranks high in importance as an agricultural crop in the Pacific Northwest states of Washington, Idaho, and Oregon. Winter annual grass weeds such as jointed goatgrass (Aegilops cylindrica), downy brome (Bromus tectorum), feral rye (Secale cereale), wild oat (Avena fatua) and Italian ryegrass (Lolium multiflorum) have the same life-cycle as winter wheat and are difficult to control in conventional wheat production systems. These weeds annually account for millions of dollars of lost wheat production and reduced quality (i.e. discount by impurities). There has been only moderate success in controlling winter annual grasses in wheat by utilizing multiple-year crop rotations with spring crops and fallow periods, and with chemical control. Selective herbicides have been available for chemical control of downy brome, Italian ryegrass, and wild oat. However, before use of imazamox herbicide with imidazolinone-resistant (CLEARFIELD*) wheat, there was no herbicide that could selectively control jointed goatgrass, feral rye, or volunteer cereals in winter wheat. The first commercial release of an imidazolinone-resistant winter wheat variety in the Pacific Northwest was made during the 2003 growing season. Plant breeders in the Pacific Northwest are continuing to develop imidazolinone-resistant winter wheat varieties adapted to a range of Pacific Northwest production regions One issue of concern for wheat varietal development is that single-gene tolerance to imazamox in CLEARFIELD* varieties can sometimes show visible crop injury, and possibly, yield reductions in response to herbicide applications. Crop tolerance can vary with time of herbicide application relative to wheat stage of growth, environmental conditions that reduce the wheat plant’s ability to metabolize imazamox and, possibly, with specific wheat varieties. A multiple year and location study was conducted to evaluate imazamox tolerance in CLEARFIELD* wheat lines being developed for Pacific Northwest production regions. Results indicate that during specific years and locations, single-gene CLEARFIELD* varieties differed slightly in their relative tolerance to imazamox. The most important determinant of crop tolerance was related to herbicide application rate and timing
Keywords
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
Anderson WP (1996) Weed science: Principles and applications, 3rd edn. West Pub. Co., New York, p 200
Ball DA, Young FL, Ogg AG Jr (1999) Selective control of jointed goatgrass with imazamox in herbicide-resistant wheat. Weed Tech 13(1):77–82
Clemmer KC, York AC, Brownie C (2004) Italian ryegrass (Lolium multiflorum) control in imidazolinone-resistant wheat. Weed Tech 18(3):481–489
Frihauf JC, Miller SD, Alford CM (2005) Imazamox rates, timings, and adjuvants affect imidazolinone-tolerant winter wheat cultivars. Weed Tech 19:599–607
Geier PW, Stahlman PW, White AD, Miller SD, Alford CM, Lyon DJ (2004) Imazamox for winter annual grass control in imidazolinone-tolerant winter wheat. Weed Tech 18(4):924–930
Newhouse KE, Smith WA, Starrett MA, Schaefer TJ, Singh BK (1992) Tolerance to imidazolinone herbicides in wheat. Plant Physiol 100:882–886
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2007 Springer
About this paper
Cite this paper
Ball, D.A., Peterson, C.J. (2007). Herbicide Tolerance in Imidazolinone-Resistant Wheat for Weed Management in the Pacific Northwest U.S.A.. In: Buck, H.T., Nisi, J.E., Salomón, N. (eds) Wheat Production in Stressed Environments. Developments in Plant Breeding, vol 12. Springer, Dordrecht. https://doi.org/10.1007/1-4020-5497-1_31
Download citation
DOI: https://doi.org/10.1007/1-4020-5497-1_31
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-5496-9
Online ISBN: 978-1-4020-5497-6
eBook Packages: Biomedical and Life SciencesBiomedical and Life Sciences (R0)