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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
Life Impact The University of Adelaide
The problem
• Resistance• Later emergence• Competitive and impacts on yield• Sheds seed prior to harvest
Life Impact The University of Adelaide
Herbicide Resistant Brome Grass Survey 2012
Herbicides North Mallee South MalleeSamples with resistance (%)
Verdict 0 0Atlantis 64 26Crusader 75 24Glyphosate 0 0
Life Impact The University of Adelaide
Change in behaviour of brome grass
0 30 60 90 120 1500
20
40
60
80
100
CropFence-line
Apr May Jun Jul AugMonth
Ger
min
atio
n (%
)
Life Impact The University of Adelaide
Management strategies usedCropping phase
Herbicide strategy (1 & 2)
HS1 HS2Lupins Simazine pre
Haloxyfop postSimazine preHaloxyfop postParaquat crop-top
TT-canola Atrazine preAtrazine plus haloxyfop post
Propyzamide preAtrazine plus haloxyfop postGlyphosate crop-top
Wheat Trifluralin preIntervix post
Sakura plus avadex preGlyphosate crop-top
Barley Trifluralin plus metribuzin pre
Trifluralin preIntervix post
Life Impact The University of Adelaide
Effect of management strategies on brome populations in 2015Cropping phase HS Brome grass
density(plants/m2)
Brome grass seed production
(paniclesm-2)
(seedsm-2)
2014 2015 4 WBS
5 WAS
18 WAS
Wheat Barley 1 1 2 17 3 522 36 42 45 1 9
TT-canola Wheat 1 5 7 10 0 02 2 3 11 27 626
Barley Lupins 1 14 28 30 1 22 1 5 6 0 0
Lupins TT-canola 1 12 4 5 0 02 7 13 4 0 0
LSD (P=0.05)† 3.4 1.4 2.5 0.8 23.1
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.