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

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Werth, J., Boucher, L., Thornby, D., Walker, S. and Charles, G. (2013) Changes in weed species since the introduction of glyphosate-resistant cotton. Crop & Pasture Science, 64 (8). pp. 791-798. ISSN 1836-0947

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Article Link: http://dx.doi.org/10.1071/CP13167


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.

Item Type:Article
Business groups:Crop and Food Science
Keywords:FF005Field Crops (NEW March 2000) FF020Plant Breeding and Genetics FF500Weeds and Noxious Plants HH410Pesticide and Drug Resistance WW100 38641-94-0 1071-83-6 70393-85-0 fallow genetic engineering genetic transformation glyphosate herbicide resistance herbicide resistant weeds herbicides transgenic plants weed control weeds Australia New South Wales Queensland Amaranthus Chloris virgata Convolvulus Conyza bonariensis Cullen Echinochloa colona Euphorbia Hibiscus Ipomoea plants Sonchus oleraceus Amaranthaceae Caryophyllales dicotyledons angiosperms Spermatophyta plants eukaryotes Amaranthus APEC countries Australasia Oceania Commonwealth of Nations Developed Countries OECD Countries Chloris Poaceae Cyperales monocotyledons Convolvulaceae Solanales Conyza Asteraceae Asterales Papilionoideae Fabaceae Fabales Echinochloa Euphorbiaceae Euphorbiales Euphorbia Malvaceae Malvales Ipomoea Australia Sonchus
Subjects:Plant culture > Field crops > Textile and fibre plants
Plant pests and diseases > Weeds, parasitic plants etc
Live Archive:21 Aug 2014 01:42
Last Modified:03 Sep 2021 16:49

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