Hostname: page-component-77c89778f8-fv566 Total loading time: 0 Render date: 2024-07-22T09:27:48.981Z Has data issue: false hasContentIssue false
  • English
  • Français

Effects of Variable Tralkoxydim Rates on Wild Oat (Avena fatua) Seed Production, Wheat (Triticum aestivum) Yield, and Economic Return

Published online by Cambridge University Press:  20 January 2017

John T. O'Donovan ,
K. Neil Harker ,
Robert E. Blackshaw  and
Robert N. Stougaard
John T. O'Donovan
Affiliation:
Agriculture and Agri-Food Canada, Box 29, Beaverlodge, AB, TOH 0CO, 6000 C&E Trail, Lacombe, AB T4L 1W1, Box 3000, Lethbridge, AB T1J 4B1
K. Neil Harker
Affiliation:
Agriculture and Agri-Food Canada, Box 29, Beaverlodge, AB, TOH 0CO, 6000 C&E Trail, Lacombe, AB T4L 1W1, Box 3000, Lethbridge, AB T1J 4B1
Robert E. Blackshaw
Affiliation:
Agriculture and Agri-Food Canada, Box 29, Beaverlodge, AB, TOH 0CO, 6000 C&E Trail, Lacombe, AB T4L 1W1, Box 3000, Lethbridge, AB T1J 4B1
Robert N. Stougaard
Affiliation:
Northwestern Agricultural Research Center, Kalispell, MT 59901
Get access Rights & Permissions [Opens in a new window]

Abstract

Field experiments were conducted at Lacombe, Lethbridge, and Vegreville, Alberta, Canada and Kalispell, MO, over several years to determine the influence of recommended (minimum label) and lower-than-recommended tralkoxydim rates on wild oat seed production, spring wheat yield, and economic return. Wild oat seed production as a function of tralkoxydim rate varied considerably among locations and years. For example, at the recommended rate, wild oat seed production varied from none at both Lethbridge and Vegreville in 1994 to over 800 seeds/m2 at Vegreville in 1995. At 50% of recommended rate, seed production varied from none at Lethbridge in 1994 to over 3,000 seeds/m2 at Vegreville in 1995. In most cases, wheat yield response to tralkoxydim rate was curvilinear. Yields generally increased exponentially as rates increased up to about 40 or 50% of the recommended rate, but then plateaued as rates were increased further. In some cases economic returns tended to plateau or decrease at rates higher than this, but reductions in economic returns at the recommended herbicide rates were, in most cases, relatively slight. In contrast, at Lethbridge in 1993 and 1995 and at Kalispell in 1994 and 1996, yield and economic returns generally increased as herbicide rate increased, and there was an economic disadvantage to reducing the tralkoxydim rate below that recommended. In view of the variable effects on wild oat seed production, and the questionable economic benefit, our study suggests that reducing the rate of tralkoxydim below that recommended may not be without risk. Further studies are necessary to determine the long-term implications of returning relatively large amounts of wild oat seed to the soil seedbank at reduced herbicide rates.

Keywords

Tralkoxydimwild oat, Avena fatua L. #3 AVEFAwheat, Triticum aestivum L. ‘Hi-line’, ‘Katepwa’, ‘Newana’, ‘Roblin’Reduced herbicide rates
Type
Research
Information
Weed Technology , Volume 17 , Issue 1 , March 2003 , pp. 149 - 156
Copyright
Copyright © Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

Barton, D. L., Thill, D. C., and Bahman, S. 1992. Integrated wild oat (Avena fatua) management affects spring barley (Hordeum vulgare) yield and economics. Weed Technol. 6: 129–135.Google Scholar
Belles, D. S., Thill, D. C., and Shafi, B. 2000. PP-604 rate and Avena fatua density effects on seed production and viability in Hordeum vulgare . Weed Sci. 48: 378–384.Google Scholar
Brain, P. and Cousens, R. 1989. An equation to describe dose response where there is stimulation of growth at low doses. Weed Res. 29: 93–96.CrossRefGoogle Scholar
Bussan, A. J., Boerboom, C. M., and Stoltenberg, D. E. 2000. Response of Setaria faberi demographic processes to herbicide rates. Weed Sci. 48: 445–453.CrossRefGoogle Scholar
Cousens, R., Doyle, C. J., Wilson, B. J., and Cousens, G. W. 1986. Modelling the economics of controlling Avena fatua in winter wheat. Pestic. Sci. 17: 1–12.Google Scholar
Dew, D. A. 1972. An index of competition for estimating crop loss due to weeds. Can. J. Plant Sci. 52: 921–927.Google Scholar
Doyle, C. J., Cousens, R., and Moss, S. R. 1986. A model of the economics of controlling Alopecurus myosuroides Huds. in winter wheat. Crop Prot. 5: 143–150.Google Scholar
Harker, K. N. and Blackshaw, R. E. 1991. Influence of growth stage and broadleaf herbicides on tralkoxydim activity. Weed Sci. 39: 650–659.Google Scholar
Holm, F. A., Kirkland, K. J., and Stevenson, F. C. 2000. Defining optimum rates and timing for wild oat control in spring wheat (Triticum aestivum). Weed Technol. 14: 167–175.CrossRefGoogle Scholar
Mulugeta, D. and Stolenberg, D. E. 1997. Weed and seedbank management with integrated methods as influenced by tillage. Weed Sci. 45: 706–715.Google Scholar
O'Donovan, J. T. 1988. Wild oat infestations and economic returns as influenced by frequency of control. Weed Technol. 2: 495–498.Google Scholar
O'Donovan, J. T., Harker, K. N., Clayton, G. W., Robinson, D., Newman, J. C., and Hall, L. M. 2001. Barley seeding rate influences the effects of variable herbicide rates on wild oat (Avena fatua). Weed Sci. 49: 746–754.Google Scholar
[SAS] Statistical Analysis Systems. 1990. SAS/STAT User's Guide. V.6, 4th ed. Cary, NC: Statistical Analysis Systems Institute. 846 p.Google Scholar
Seefeldt, S. S., Jensen, J. E., and Fuerst, E. P. 1995. Log-logistic analysis of herbicide dose-response relationships. Weed Technol. 9: 218–227.Google Scholar
Spandl, E. B., Durgan, R., and Miller, D. W. 1997. Wild oat (Avena fatua) control in spring wheat (Triticum aestivum) and barley (Hordeum vulgare) with reduced rates of postemergence herbicides. Weed Technol. 11: 591–597.Google Scholar
Stevenson, F. C., Holm, F. A., and Kirkland, K. J. 2000. Optimizing wild oat (Avena fatua) control with ICIA 0604. Weed Technol. 14: 608–616.Google Scholar
Stougaard, R. N. 1999. Carrier volume adjustments improve imazamethabenz efficacy. Weed Technol. 13: 277–232.CrossRefGoogle Scholar
Stougaard, R. N., Maxwell, B. D., and Harris, J. D. 1997. Influence of application timing on the efficacy of reduced rate postemergence herbicides for wild oat (Avena fatua) control in spring barley (Hordeum vulgare). Weed Technol. 11: 283–289.CrossRefGoogle Scholar
Wille, M. J., Thill, D. C., and Price, W. J. 1998. Wild oat (Avena fatua) seed production in spring barley (Hordeum vulgare) is affected by the interaction of wild oat density and herbicide rate. Weed Sci. 46: 336–343.Google Scholar
Zhang, J., Weaver, S. E., and Hamill, A. S. 2000. Risks and reliability of using herbicides at below-labeled rates. Weed Technol. 14: 106–115.CrossRefGoogle Scholar