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Life Impact The University of Adelaide
Integrated Management of Brome
Christopher Preston, Sam Kleemann and
Gurjeet Gill
S...
Life Impact The University of Adelaide
The problem
• Resistance
• Later emergence
• Competitive and impacts on yield
• She...
Life Impact The University of Adelaide
Herbicide Resistant Brome Grass
Survey 2012
Herbicides North Mallee South Mallee
Sa...
Life Impact The University of Adelaide
Change in behaviour of brome grass
0 30 60 90 120 150
0
20
40
60
80
100
Crop
Fence-...
Life Impact The University of Adelaide
Life Impact The University of Adelaide
Intervix (1.8 L ha-1) resistant brome
from SA Mallee
Life Impact The University of Adelaide
Long term brome management -
Balaklava
Life Impact The University of Adelaide
Management strategies used
Cropping
phase
Herbicide strategy (1 & 2)
HS1 HS2
Lupins...
Life Impact The University of Adelaide
Effect of management strategies on
brome seed bank
Life Impact The University of Adelaide
Effect of management strategies on
brome populations in 2015
Cropping phase HS Brom...
Life Impact The University of Adelaide
Conclusions
• Seed bank persistence of brome is high (25%),
so more than 1 year of ...
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Integrated management of brome - Chris Preston (Uni of Adelaide)

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The problem
• Resistance
• Later emergence
• Competitive and impacts on yield
• Sheds seed prior to harvest

Published in: Science
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Integrated management of brome - Chris Preston (Uni of Adelaide)

  1. 1. Life Impact The University of Adelaide Integrated Management of Brome Christopher Preston, Sam Kleemann and Gurjeet Gill School of Agriculture, Food & Wine, University of Adelaide
  2. 2. Life Impact The University of Adelaide The problem • Resistance • Later emergence • Competitive and impacts on yield • Sheds seed prior to harvest
  3. 3. Life Impact The University of Adelaide Herbicide Resistant Brome Grass Survey 2012 Herbicides North Mallee South Mallee Samples with resistance (%) Verdict 0 0 Atlantis 64 26 Crusader 75 24 Glyphosate 0 0
  4. 4. Life Impact The University of Adelaide Change in behaviour of brome grass 0 30 60 90 120 150 0 20 40 60 80 100 Crop Fence-line Apr May Jun Jul Aug Month Germination(%)
  5. 5. Life Impact The University of Adelaide
  6. 6. Life Impact The University of Adelaide Intervix (1.8 L ha-1) resistant brome from SA Mallee
  7. 7. Life Impact The University of Adelaide Long term brome management - Balaklava
  8. 8. Life Impact The University of Adelaide Management strategies used Cropping phase Herbicide strategy (1 & 2) HS1 HS2 Lupins Simazine pre Haloxyfop post Simazine pre Haloxyfop post Paraquat crop-top TT-canola Atrazine pre Atrazine plus haloxyfop post Propyzamide pre Atrazine plus haloxyfop post Glyphosate crop-top Wheat Trifluralin pre Intervix post Sakura plus avadex pre Glyphosate crop-top Barley Trifluralin plus metribuzin pre Trifluralin pre Intervix post
  9. 9. Life Impact The University of Adelaide Effect of management strategies on brome seed bank
  10. 10. Life Impact The University of Adelaide Effect of management strategies on brome populations in 2015 Cropping phase HS Brome grass density (plants/m2) Brome grass seed production (panicles m-2) (seeds m-2) 2014 2015 4 WBS 5 WAS 18 WAS Wheat Barley 1 1 2 17 3 52 2 36 42 45 1 9 TT-canola Wheat 1 5 7 10 0 0 2 2 3 11 27 626 Barley Lupins 1 14 28 30 1 2 2 1 5 6 0 0 Lupins TT-canola 1 12 4 5 0 0 2 7 13 4 0 0 LSD (P=0.05)† 3.4 1.4 2.5 0.8 23.1
  11. 11. Life Impact The University of Adelaide Conclusions • Seed bank persistence of brome is high (25%), so more than 1 year of control is required • Effective pre- and post-emergent herbicides followed by crop topping in lupins and canola reduced brome seed numbers to low levels • Complete reliance on pre-emergent herbicides in cereals allowed seed numbers to increase • Resistance to Intervix is not far away. • Two year strategy to drive down numbers. Use Intervix in the cereal crop with other herbicides and crop topping in break crop.

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