Changes in weed species since the introduction of glyphosate-resistant cotton

Werth, Jeff, Boucher, Luke, Thornby, David, Walker, Steve and Charles, Graham (2013) Changes in weed species since the introduction of glyphosate-resistant cotton. Crop and Pasture Science, 64 8: 791-798. doi:10.1071/CP13167

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Author Werth, Jeff
Boucher, Luke
Thornby, David
Walker, Steve
Charles, Graham
Title Changes in weed species since the introduction of glyphosate-resistant cotton
Journal name Crop and Pasture Science   Check publisher's open access policy
ISSN 1836-0947
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1071/CP13167
Open Access Status Not yet assessed
Volume 64
Issue 8
Start page 791
End page 798
Total pages 8
Place of publication Collingwood, VIC Australia
Publisher C S I R O Publishing
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
1110 Nursing
Abstract Weed management practices in cotton systems that were based on frequent cultivation, residual herbicides, and some post-emergent herbicides have changed. The ability to use glyphosate as a knockdown before planting, in shielded sprayers, and now over-the-top in glyphosate-tolerant cotton has seen a significant reduction in the use of residual herbicides and cultivation. Glyphosate is now the dominant herbicide in both crop and fallow. This reliance increases the risk of shifts to glyphosate-tolerant species and the evolution of glyphosate-resistant weeds. Four surveys were undertaken in the 2008-09 and 2010-11 seasons. Surveys were conducted at the start of the summer cropping season (November-December) and at the end of the same season (March-April). Fifty fields previously surveyed in irrigated and non-irrigated cotton systems were re-surveyed. A major species shift towards Conyza bonariensis was observed. There was also a minor increase in the prevalence of Sonchus oleraceus. Several species were still present at the end of the season, indicating either poor control and/or late-season germinations. These included C. bonariensis, S. oleraceus, Hibiscus verdcourtii and Hibiscus tridactylites, Echinochloa colona, Convolvulus sp., Ipomea lonchophylla, Chamaesyce drummondii, Cullen sp., Amaranthus macrocarpus, and Chloris virgata. These species, with the exception of E. colona, H. verdcourtii, and H. tridactylites, have tolerance to glyphosate and therefore are likely candidates to either remain or increase in dominance in a glyphosate-based system.
Keyword Glyphosate resistance
Glyphosate resistant cotton
Species shift
Weed survey
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 8 times in Scopus Article | Citations
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Created: Tue, 03 Dec 2013, 10:39:46 EST by System User on behalf of Qld Alliance for Agriculture and Food Innovation