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Timing and Dose of Metolachlor Affect Rigid Ryegrass (Lolium rigidum) Control in Wheat

  • Bhagirath S. Chauhan (a1), Gurjeet S. Gill (a1) and Christopher Preston (a2)
Abstract

The efficacy of metolachlor on rigid ryegrass was determined under a no-till seeding system in an experiment conducted in 2004 and 2005 in South Australia. Metolachlor at a rate of 0.48 and 0.96 kg ai/ha was applied at 40 or 46 d (very early preplant, VEPP) and 20 or 23 d before crop sowing (early preplant, EPP), and at sowing (preplant, PP) in 2004 and 2005; the herbicide was incorporated by sowing. The control of rigid ryegrass was greater than 80% when metolachlor was applied PP; however, that application resulted in phytotoxic effects on emergence and yield of wheat; metolachlor was more phytotoxic when applied at 0.96 kg/ha than at 0.48 kg/ha. Metolachlor applied EPP provided 71 to 83% rigid ryegrass control, whereas VEPP application provided only 33 to 49% control. Reduction in wheat grain yield was not observed at these application times. This study indicates that metolachlor at 0.48 kg/ha could be safely applied around 20 d before crop sowing to selectively control rigid ryegrass in wheat.

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Corresponding author's E-mail: b.chauhan2@cgiar.org
References
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Accinelli C., Dinelli G., and Vicari A. 2001. Atrazine and metolachlor degradation in subsoils. Biol. Fert. Soils 33:495500.
Ahrens W. H. 1994. Herbicide Handbook. 7th ed. Champaign, IL Weed Science Society of America. 197220.
Beestman G. B. and Deming J. M. 1974. Dissipation of acetanilide herbicides from soils. Agron. J. 66:308311.
Llewellyn R. S. and Powles S. B. 2001. High levels of herbicide resistance in rigid ryegrass (Lolium rigidum) in the wheat belt of Western Australia. Weed Technol. 15:242248.
McAlister F. M., Holtum J. A. M., and Powles S. B. 1995. Dinitroaniline herbicide resistance in rigid ryegrass (Lolium rigidum). Weed Sci. 43:5562.
Mueller T. C., Shaw D. R., and Witt W. W. 1999. Relative dissipation of acetochlor, alachlor, metolachlor, and SAN 582 from three surface soils. Weed Technol. 13:341346.
Ritter R. L. and Menbere H. 2002. Preemergence control of Italian ryegrass (Lolium multiflorum) in wheat (Triticum aestivum). Weed Technol. 16:5559.
Rouchaud J., Neus O., Cools K., and Bulcke R. 1999. Flufenacet soil persistence and mobility in corn and wheat crops. Bull. Environ. Contam. Toxicol. 63:460466.
Walsh M. J., Devlin R. D., and Powles S. B. 2004. Potential for preseason herbicide application to prevent weed emergence in the subsequent growing season. 1. Identification and evaluation of possible herbicides. Weed Technol. 18:228235.
Zimdahl R. L. and Clark S. K. 1982. Degradation of three acetanilide herbicides in soil. Weed Sci. 30:545548.
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Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
  • URL: /core/journals/weed-technology
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