Title: Species shift and resistance: Challenges for Australian cotton systems
Abstract: Weed control practices in the Australiancotton industry, both in crop and fallow, are now heavilyreliant on glyphosate. Even before the introductionof glyphosate-tolerant varieties, glyphosate wasincreasingly being used for pre-plant knockdowns,and shielded sprays within the crop. To determineany changes in species composition resulting fromthis reliance on glyphosate, we re-surveyed 50 fieldspreviously surveyed in 2001. Results showed a speciesshift, with flaxleaf fleabane and sowthistle now dominatingthe flora in cotton systems. Other glyphosatetolerantspecies, such as Australian bindweed, havealso increased in a number of fields. Bladder ketmia,peachvine and awnless barnyard grass were also commonin the majority of fields. A further threat to theindustry was the identification of the first glyphosateresistantweed in Australian cotton systems, awnlessbarnyard grass. This paper outlines these challengesfor the industry, and explores a range of chemicalmanagement options for these glyphosate-tolerantand resistant weeds.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 8
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