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Influence of Application Timing on the Efficacy of Reduced Rate Postemergence Herbicides for Wild Oat (Avena fatua) Control in Spring Barley (Hordeum vulgare)

Published online by Cambridge University Press:  12 June 2017

Robert N. Stougaard ,
Bruce D. Maxwell  and
Jerry D. Harris
Robert N. Stougaard
Affiliation:
Northwestern Agricultural Research Center, Kalispell, MT 59901
Bruce D. Maxwell
Affiliation:
Department of Plant, Soils and Environmental Sciences, Montana State University, Bozeman, MT 59717
Jerry D. Harris
Affiliation:
Central Agricultural Research Center, Moccasin, MT 59462
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Abstract

Field experiments were conducted during 1992 and 1993 at Kalispell and Moccasin, MT, to determine the influence of application timing on the efficacy of reduced rate postemergence applications of imazamethabenz and diclofop in spring barley. Herbicides were applied at their respective 1 × and ½ × use rates at either 1, 2, or 3 weeks after crop emergence (WAE). While excellent wild oat control was sometimes achieved with reduced rates, there was no consistent relationship between wild oat growth stage and the level of control at either site regardless of the herbicide or rate applied. This response suggests that efficacy is governed not only by wild oat growth stage, but also by weed demographics and environmental considerations. Barley yield and adjusted gross return values were highest at Kalispell when imazamethabenz treatments were applied at 1 WAE, regardless of the level of wild oat control. Adjusted gross return values were similar for the 1 × and ½ × imazamethabenz treatments. Yields and adjusted gross returns with diclofop treatments were more related to the level of wild oat control at Kalispell, with the 1 × diclofop treatments providing the greatest yields and adjusted gross return values. The level of wild oat control at Moccasin had minimal effect on barley yield and adjusted gross returns, with both values being comparable to the nontreated check.

Keywords

Diclofop, (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acidimazamethabenz, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-4(and 5)-methylbenzoic acid (3: 2), methylesterwild oat, Avena fatua L. # AVEFAspring barley, Hordeum vulgare L.Growth stageinterferencephenologyAVEFAWAE, weeks after crop emergence
Type
Research
Information
Weed Technology , Volume 11 , Issue 2 , June 1997 , pp. 283 - 289
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

Literature Cited

Andersson, L. 1996. Characteristics of seeds and seedlings from weeds treated with sublethal herbicide doses. Weed Res. 36:55–64.CrossRefGoogle Scholar
Barrentine, W. L. 1989. Minimum effective rate of chlorimuron and imazaquin applied to common cocklebur (Xanthium strumarium). Weed Technol. 3:126–130.Google Scholar
Defelice, M. S., Brown, W. B., Aldrich, R. J., Sims, B. D., Judy, D. T., and Guethle, D. R. 1989. Weed control in soybeans (Glycine max) with reduced rates of postemergence herbicides. Weed Sci. 37:365–374.CrossRefGoogle Scholar
Devlin, D. L., Long, J. H., and Maddux, L. D. 1991. Using reduced rates of postemergence herbicides in soybeans (Glycine max). Weed Technol. 5:834–840.Google Scholar
Edmund, R. M. Jr. and York, A. C. 1987. Factors affecting postemergence control of sicklepod (Cassia obtusifolia) with imazaquin and DPX-F6025: spray volume, growth stage, and soil-applied alachlor and vernolate. Weed Sci. 35:216–223.Google Scholar
Harker, K. N. and O'Sullivan, P. A. 1991. Effect of imazamethabenz on green foxtail, tartary buckwheat and wild oat at different growth stages. Can. J. Plant Sci. 71:821–829.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
Klingaman, T. E., King, C. A., and Oliver, L. R. 1991. Effect of application rate, weed species, and weed stage of growth on imazethapyr activity. Weed Sci. 40:227–232.CrossRefGoogle Scholar
Malefyt, T. and Quakenbush, L. 1991. Influence of environmental factors on the biological activity of imidazolinone herbicides. In Shaner, D. L. and O'Connor, S. L., eds. The Imidazolinone Herbicides. Boca Raton, FL: CRC Press. pp. 104–126.Google Scholar
Miller, S. D. and Alley, H. P. 1987. Weed control and rotational crop response with AC 222,293. Weed Technol. 1:29–33.Google Scholar
Morrison, I. N. and Maurice, D. C. 1984. The relative response of two foxtail (Setaria) species to diclofop. Weed Sci. 32:686–690.Google Scholar
Nalewaja, J. D. 1977. Wild oats: global gloom. Proc. West. Soc. Weed Sci. 30:21–32.Google Scholar
O'Donovan, J. T., de St. Remy, E. A., O'Sullivan, P. A., Dew, D. A., and Sharma, A. K. 1985. Influence of the relative time of emergence of wild oat (Avena fatua) on yield loss of barley (Hordeum vulgare) and wheat (Triticum aestivum). Weed Sci. 33:498–503.Google Scholar
Prostko, E. P. and Meade, J. A. 1993. Reduced rates of postemergence herbicides in conventional soybeans (Glycine max). Weed Technol. 7:365–369.Google Scholar
Sands, J. K. and Lund, C. E. 1994. Montana agricultural statistics. Volume 31. Helena MT: Montana Agricultural Statistics Services. 96 p.Google Scholar
Schreiber, M. M., Warren, G. F., and Orwick, P. L. 1979. Effects of wetting agent, stage of growth and species on the selectivity of diclofop. Weed Sci. 27:679–683.CrossRefGoogle Scholar
Steckel, L. E., Defelice, M. S., and Sims, B. D. 1990. Integrating reduced rates of postemergence herbicides and cultivation for broadleaf weed control in soybeans (Glycine max). Weed Sci. 38:541–545.CrossRefGoogle Scholar
Steel, R.G.D. and Torrie, J. H. 1980. Principles and Procedures of Statistics. New York: McGraw-Hill. 633 p.Google Scholar
Todd, B. G. and Stobbe, E. H. 1977. Selectivity of diclofop methyl among wheat, barley, wild oat (Avena fatua) and green foxtail (Setaria viridis). Weed Sci. 25:382–385.CrossRefGoogle Scholar