School of Agriculture, Food and Wine

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https://hdl.handle.net/2440/7

The School of Agriculture, Food & Wine provides a world-class concentration of scientific research, education and infrastructure on the Waite Campus with a smaller presence on the Roseworthy Campus. Research interests within the School include plant sciences, plant biotechnology, plant breeding, agronomy, soil science, integrated pest management, horticulture, viticulture, oenology, wine business, food science, and agricultural & resource economics.

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Browsing School of Agriculture, Food and Wine by Author "18th Australasian Weeds Conference (8 Oct 2012 - 11 Oct 2012 : Melbourne, Victoria)"

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    Glyphosate resistance in barnyard grass (Echinochloa colona)
    (Weed Society of Victoria Inc., 2012) Thai, H.; Malone, J.; Boutsalis, P.; Preston, C.; 18th Australasian Weeds Conference (8 Oct 2012 - 11 Oct 2012 : Melbourne, Victoria); Eldershaw, V.
    Echinochloa colona is an important summer-growing weed species in northern Australian cropping regions. As a result of the intensive use of glyphosate in summer fallows, glyphosate resistant populations of E. colona have evolved, with the number of resistant populations identified rapidly growing. This study identified glyphosate resistance in E. colona collected from different locations in Australia and investigated the mechanism of glyphosate resistance. Pot trials conducted on populations ofE. colona collected from northern Australia identified resistance to glyphosate in 11 populations of this weed species. The level of resistance varied among the populations from 2- to 11-fold. Sequencing of the target-site (EPSPS) identified a mutation at position 106 leading to a change from proline to serine in the most resistant population A533.1 only. With the range of resistance levels identified, it is expected that different mechanisms of resistance will be present among the rest of the resistant populations.
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    Herbicide cross resistance in Bromus diandrus and B. rigidus populations across southeastern Australia
    (Weed Society of Victoria Inc., 2012) Boutsalis, P.; Preston, C.; Gill, G.; 18th Australasian Weeds Conference (8 Oct 2012 - 11 Oct 2012 : Melbourne, Victoria); Eldershaw, V.
    Herbicide resistance to Group A (AC Case-inhibiting herbicides) and B herbicides (ALSinhibiting herbicides) in Bromus diandrus and B. rigidus is becoming more common in southeastern Australia but there is limited information available on its regional distribution in either species. At present it is unclear if resistant brome populations differ in their response to different herbicides within the same herbicide group. Another unresolved question is related to the herbicide dose response of resistant brome populations. This study identified differences between Group A herbicides in their activity on resistant brome. However, increasing herbicide dose only marginally improved weed control in most cases. Varying degrees of Group B resistance was also detected in four brome populations. These initial findings suggest that increasing herbicide dose is unlikely to improve brome control but some Group A and B herbicides are more effective than others in controlling resistant populations.
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    Occurrence of glyphosate resistant annual ryegrass (Lolium rigidum) on fence lines of South Australian cropping fields
    (Weed Society of Victoria Inc., 2012) Adu-Yeboah, P.; Preston, C.; Boutsalis, P.; Gill, G.; 18th Australasian Weeds Conference (8 Oct 2012 - 11 Oct 2012 : Melbourne, Victoria); Eldershaw, V.
    Glyphosate resistance in annual ryegrass has been reported at 63 fence line sites in Australia. As growers continue to rely heavily on this herbicide to control annual ryegrass on their fence lines, the number of resistant populations is expected to increase. A survey was undertaken to assess annual ryegrass from fence lines in South Australia that had been treated with glyphosate for five or more years. Plants were collected from fence lines and tested for resistance to glyphosate using the Syngenta Quick Test. Of the fifteen fence lines surveyed, ten had annual ryegrass plants with resistance to glyphosate. A dose response experiment conducted on one putative resistant population collected from a fence line in Clare, South Australia, showed 11-fold greater resistance to glyphosate than the susceptible control.