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Weed Management Impacts on the Population Dynamics of Barnyardgrass (Echinochloa crus-galli) in Glyphosate-Resistant Cotton in Australia

Published online by Cambridge University Press:  20 January 2017

Jeff A. Werth ,
Christopher Preston ,
Grant N. Roberts  and
Ian N. Taylor
Jeff A. Werth*
Affiliation:
School of Wine and Agriculture, University of Adelaide and CRC for Australian Weed Management, PMB 1, Waite Campus, Glen Osmond, Australia 5064 and Cotton Catchment Communities CRC, Locked Bag 1001, Narrabri, Australia 2390
Christopher Preston
Affiliation:
School of Wine and Agriculture, University of Adelaide and CRC for Australian Weed Management, PMB 1, Waite Campus, Glen Osmond, Australia 5064 and Cotton Catchment Communities CRC, Locked Bag 1001, Narrabri, Australia 2390
Grant N. Roberts
Affiliation:
CSIRO Plant Industry, Locked Bag 1001, Narrabri, Australia 2390
Ian N. Taylor
Affiliation:
Cotton Research and Development Corporation, P.O. Box 282, Narrabri, Australia 2390
*
Corresponding author's E-mail: [email protected]
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Abstract

An experiment was conducted to determine the population dynamics of barnyardgrass under a range of weed management treatments in glyphosate-resistant (GR) cotton in Australia. These treatments consisted of glyphosate herbicide only (Glyphosate only), glyphosate herbicide plus a combination of conventional or integrated weed management practices (Glyphosate + IWM), glyphosate herbicide plus a reduced residual herbicide program (Glyphosate + Res.), glyphosate herbicide plus a grass herbicide (Glyphosate + Grass), and a combination of conventional weed management practices (IWM only). The experiment investigated the effects of weed management on the weed seed bank, weed emergence patterns, and weed populations. After three years, all treatments resulted in commercially acceptable control of barnyardgrass. However, treatments containing soil-applied residual herbicides proved more effective over the period of the experiment. Seed bank reductions were in the order of 100-fold over the period of the experiment for treatments that received residual herbicides compared to 10- to 20-fold reductions for treatments that did not. The experiment highlighted the importance of early-season weed control, as well as the importance of an integrated approach to weed management with residual herbicides to control later-emerging weeds in GR cotton.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGcotton, Gossypium hirsutum L.Integrated weed managementpopulation dynamicsthresholdsweed seed bank
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 190 - 194
Copyright
Copyright © Weed Science Society of America 

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