The effect of integrating defoliation with herbicides on barley grass survival in a legume pasture

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Barley grass (Hordeum spp.) is an annual weed of southern Australian mixed farming regions causing significant crop revenue loss and carcass
damage in grazing sheep. Increased reliance on herbicides for management of barley grass has led to the development of herbicide resistance across southern
Australia. Integrated weed management tactics have recently been used to manage barley grass populations, and have proven effective in reducing reliance on herbicides for management. Field studies performed in 2016 and 2017 examined the use of post-emergent herbicides and strategic defoliation through mowing on a barley grass infestation in a mixed legume pasture in Wagga Wagga, NSW. This paper presents data from the first year of the study. Significant differences between herbicide-only treatments revealed propaquizafop to be 99% effective in reducing barley grass survival and
seed production in contrast to paraquat, which was generally ineffective. A significant interaction between mowing and date also influenced barley grass biomass, and complex interactions between herbicide, mowing and date influenced barley grass height. Barley grass control, as a result of propaquizafop application, was accompanied by an increase in the biomass of clover and other weeds including Vulpia spp., also a known carcass contaminant.
Original languageEnglish
Title of host publicationProceedings of the 21st Australian Weed Conference
Subtitle of host publicationWeed Biosecurity - Protecting our Future
EditorsStephen Johnson, Leslie Weston, Hanwen Wu , Bruce Auld
Place of PublicationSydney
PublisherWeed Society of NSW
Number of pages5
ISBN (Print)9780995415911
Publication statusPublished - 2018
Event21st Australasian Weeds Conference (2018) - Novotel Sydney Manly Pacific, Sydney, Australia
Duration: 09 Sep 201813 Sep 2018 (conference proceedings) (conference program)


Conference21st Australasian Weeds Conference (2018)
Abbreviated titleWeed biosecurity - Protecting our future
OtherThe Weed Society of New South Wales Inc., on behalf of the Council of Australasian Weed Societies Inc., will be hosting the 21st Australasian Weeds Conference in the popular Sydney beach side suburb of Manly from 9 - 12 September 2018.  An assortment of field trips will be hosted on Thursday 13 September 2018.
This biennial conference carries on a long tradition of bringing the weed management community together to discuss new developments and share information about cutting-edge and best weed management practices.
The conference attracts over 250 delegates from across Australasia and globally.  Delegates will come together to network with peers, engage with industry sponsors, listen and participate in presentations and field trips on a variety of topics including; 
- New technologies in weed management.
- Biological, mechanical, and chemical weed control and research.
- Herbicide resistance.
- Weeds of crops and pastures.
- Environmental weeds and Weeds of National Significance.
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