17th Australasian Weeds Conference (2010)

“New Frontiers in New Zealand: Together we can beat the weeds”

Christchurch Convention Centre, Christchurch, New Zealand.
26-30 September 2010.
Peer-reviewed proceedings edited by S.M. Zydenbos.
Published by New Zealand Plant Protection Society
ISBN 978-0-86476-239-9

Keynote

Integrated vegetation management along roadsides in the south-eastern United States
Dr Fred H. Yelverton and Travis W. Gannon   pp. 1-13
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Non-chemical methods of weed control: benefits and limitations
Stephen R. Moss   pp. 14-19
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Crops

Species shift and resistance: challenges for Australian cotton systems
Jeff Werth, David Thornby, Steve Walker, Graham Charles and Craig McDonald   pp. 20-23
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Enhanced degradation of atrazine in soils with a history of repeated use
Trevor K. James, Anis Rahman, Michael R. Trolove and Michael D. Parker   pp. 24-27
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Evaluation of alternative herbicide systems for the sweetpotato crop
Steve L. Lewthwaite, Chris M. Triggs and John J.C. Scheffer   pp. 28-31
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Broom corn millet (Panicum miliaceum): a new menace for maize and sweetcorn growers in New Zealand
Trevor K. James, Anis Rahman and Pathik Trivedi   pp. 32-35
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Herbicide application: an important factor in herbicide efficacy
Hossein Najafi   pp. 36-39
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Opportunities to improve cultural approaches to manage weeds in direct-seeded rice
Bhagirath S. Chauhan and David E. Johnson   pp. 40-43
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Emergence, survival and seed production of curly windmill grass in wheat or pasture systems
Catherine P.D. Borger, Glen Riethmuller and Abul Hashem   pp. 44-47
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Control of windmill grass over the summer fallow increases wheat yield
Catherine P.D. Borger, Glen Riethmuller and Abul Hashem   pp. 48-51
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The effect of annual ryegrass (Lolium rigidum) interference on the growth of four common Australian crop species
Joseph R. Moore, James E. Pratley and Alexa N. Seal   pp. 52-55
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Effect of temperature on endophyte and plant growth of annual ryegrass, perennial ryegrass and tall fescue
Karen A. Kirkby, David E. Hume, James E. Pratley and John C. Broster   pp. 56-59
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Canola competition for weed suppression
Deirdre Lemerle, Peter Lockley, David Luckett and Hanwen Wu   pp. 60-62
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Weed suppression by crop competition in three crop species in Western Australia
Abul Hashem, Catherine P.D. Borger and Glen Riethmuller   pp. 63-66
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Effect of tillage on weed seed bank and weed flora in maize (Zea mays)
K. Kashe, B. Sindel, P. Kristiansen and R. Jessop   pp. 67-70
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Image analysis for the detection of three-horned bedstraw seed in grain
John H. Moore and Murray Gillespie   pp. 71-73
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Potential climate change impacts on agricultural weeds in the Northern Agricultural Region of Western Australia
Pippa J. Michael, Paul B. Yeoh and John K. Scott   pp. 74-75
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Weed seed bank response to 12 years of different fertilisation systems
Benny De Cauwer, Karel van den Berge, Mathias Cougnon, Robert Bulcke and Dirk Reheul   p. 76
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A brief history of herbicide use in western Canada
Frederick A. Holm and Eric N. Johnson   pp. 77-79
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Weed control through seedling abrasion with an organic fertiliser
Frank Forcella, Trevor James and Anis Rahman   p. 80
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Significant weeds

Boneseed in Australia: research, management and coordinated action
Hillary Cherry   pp. 81-84
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Do the aims of weed management programs align with the objectives of weed policy?
Paul O. Downey   pp. 85-86
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What weeds? Is the community really interested? Trials and tribulations of a weed mapping, data sharing and community engagement project in Far North Queensland
Travis A. Sydes, Tina Lawson and Sharlene Blakeney   pp. 87-90
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Good will and best practice – controlling oleander (Nerium oleander) in Parachilna Gorge, South Australia
Lorraine J. Edmunds   pp. 91-94
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Some factors that may influence the invasiveness of Mikania micrantha Kunth ex H.B.K. in Fiji
A.R. Macanawai, M.D. Day, T. Tumaneng-Diete and S.W. Adkins   pp. 95-98
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Population viability analysis models for Lantana camara L. (Verbenaceae): a weed of national significance
Olusgeun O. Osunkoya, Christine Perrett and Chandima Fernando   pp. 99-102
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Beating bridal creeper and other Asparagus weeds
Shauna Potter, Peter J. Turner and Louise Morin   pp. 103-106
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The gorse (Ulex europaeus) eradication programme in Western Australia
John H. Moore and Matthew Kennewell   pp. 107-110
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Development of strategies for the eradication of gorse (Ulex europaeus L.) at a wind farm construction site in North-East Tasmania
Jamie Cooper and Nicholas Summers   pp. 111-112
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Slasher covers and fans to minimise roadside weed spread
Charles J. Grech, Sandra Weller and David A. McLaren   pp. 113-115
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Frequency and density of Mikania micrantha and other weeds in taro and banana systems in eastern Viti Levu, Fiji
A.R. Macanawai, M.D. Day, T. Tumaneng-Diete and S.W. Adkins   pp. 116-119
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Parthenium

Parthenium weed (Parthenium hysterophorus L.) research in Australia: new management possibilities
Steve W. Adkins, Chris O’Donnell, Naeem Khan, Thi Nguyen, Asad Shabbir, Kunjitapatham Dhileepan, Doug George and Sheldon Navie   pp. 120-123
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The reproductive capacity of parthenium weed (Parthenium hysterophorus L.) under different climatic conditions
Thi L.T. Nguyen, Sheldon C. Navie and Steve W. Adkins   pp. 124-127
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Coordinated control of parthenium weed in the Maranoa-Balonne catchment
Lavinnia Fiedler and Darren Marshall   pp. 128-130
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Competitive displacement of parthenium weed with beneficial native and introduced pasture plants in central Queensland, Australia
Naeem Khan, Chris O’Donnell, Asad Shabbir and Steve W. Adkins   pp. 131-134
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Management of parthenium weed: enhancing the effectiveness of biological control through competition from beneficial plants Asad Shabbir, Kunjitapatham Dhileepan, Chris O’Donnell, Naeem Khan and
Steve W. Adkins   pp. 135-137
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The effect of parthenium weed (Parthenium hysterophorus L.) on plant diversity in pastures in Queensland, Australia
Thi L.T. Nguyen, Sheldon C. Navie and Steve W. Adkins   p. 138
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Allelopathy

Herbicidal potential of Eucalyptus dundasii on Lolium rigidum Gaud. and Hordeum spp.
Hanwen Wu, Jinbiao Zhang, Rex Stanton, Min An, De Li Liu and Deirdre Lemerle   pp. 139-142
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Rice straw as an allelopathic agent for controlling weeds
Tarek A. El-Shahawy   pp. 143-146
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Allelopathic response of wheat (Triticum aestivum L.) straw on germination and growth of selected weed species
G.P. Satsangi, Garima Bartariya and Anjali Saxena   pp. 147-149
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Density-dependent wheat allelopathy: effectiveness for weed control, associated root interaction and morphology changes
Chunjie Li, Min An, Long Li and Jim Pratley   pp. 150-152
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Allelopathic potential of root exudates of annual ryegrass (Lolium rigidum)
R. Amini, M. An, J. Pratley and S. Azimi   pp. 153-156
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Enhancing the levels of sorgoleone in roots of Sorghum bicolor
M.R. Uddin, S.U. Park and J.Y. Pyon   p. 157
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Naturalisation and emergence rates

Are transformer weeds ecological rule breakers?
Andy W. Sheppard, Jane A. Catford, Curt C. Daehler, Denise Hardesty, Helen T. Murphy, Jan Pergl, Marcel Rejmanek, David A. Westcott and Peter J. Bellingham   pp. 158-161
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Predicting invasion success: a basic framework using plant functional traits
Nicolas P. Gross, Richard Duncan and Philip E. Hulme   pp. 162-165
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Reducing the threat of a nationally significant weed to biodiversity: four years of implementation of the NSW Bitou Bush Threat Abatement Plan
Mark A. Hamilton, Peter J. Turner, Neil Rendell and Paul O. Downey   pp. 166-169
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Emerging ecological weeds within Canterbury – current distributions and potential threats
Alan McDonald   pp. 170-173
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Persicaria chinensis – a new alien Asian invader?
David J. Galloway and Vivienne E. Lepper   pp. 174-175
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Managing the weed risk of cultivated Arundo donax L.
John G. Virtue, Tim Reynolds, Jenna Malone, Chris Preston and Chris Williams   pp. 176-179
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Mimosa pigra L. – a new incursion into Western Australia
Sandra (Sandy) G. Lloyd and Tracey L. Vinnicombe   pp. 180-181
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Colonisation of agricultural regions in Western Australia by Conyza bonariensis
Catherine P.D. Borger, Greg Doncon and Abul Hashem   pp. 182-185
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The detection of weeds on Australian farms
Brian M. Sindel, Michael Coleman, Annemieke Schneider and Ian Reeve   pp. 186-189
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Gone with the wind: high-resolution analysis of pine dispersal in New Zealand mountains
Paul Caplat, Shaun Coutts and Yvonne M. Buckley   pp. 190-193
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Risk assessment predicts success at the introduction and naturalisation but not the spread stages of invasion for commercial forestry trees (Pinus spp.)
Kirsty F. McGregor, Michael S. Watt, Philip E. Hulme and Richard P. Duncan   p. 194
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Establishing weed management priorities in a changing climate: NSW ski resorts
Mellesa Schroder   pp. 195-197
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Assessing weed spread in Australia using pathway risk analysis
Michael J. Coleman, Brian M. Sindel, Annemieke W. Schneider and Ian J. Reeve   pp. 198-201
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Climate change – managing the waking sleepers
Jeanine Baker   pp. 202-204
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Fine-scale weed mapping of two mining leases in Northern Australia
Cherie Gellert   pp. 205-206
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Under-representation of weeds in herbarium collections: a case study using Thinopyrum junceiforme and Polygala myrtifolia on the South East coast of South Australia
Chris Brodie   pp. 207-210
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Biocontrol

Biocontrol of weeds in New Zealand: an overview of nearly 85 years
Simon V. Fowler, Quentin Paynter, Lynley Hayes, Sarah Dodd and Ronny Groenteman   pp. 211-214
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Investigations into biological control of Chilean needle grass (Nassella neesiana) in Australia and New Zealand
Freda A. Anderson, Lucrecia Gallego, Gabriel Roth, Eduardo Botto, David McLaren and Jane Barton   pp. 215-218
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In vitro assessment of Stromatinia cepivora as a potential biological control agent for angled onion (Allium triquetrum) in Victoria, Australia
Parsa Tehranchian, A.C. Lawrie and Robin Adair   pp. 219-222
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Exploration for potential biological control agents of Euphorbia paralias, a major environmental weed of coastal ecosystems in Australia
John K. Scott, Mireille Jourdan, Louise Morin, Thierry Thomann and Paul B. Yeoh   pp. 223-226
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Response of two Chrysolina species to different Hypericum hosts
Ronny Groenteman, Simon V. Fowler and Jon J. Sullivan   pp. 227-230
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New biological control opportunities for prickly acacia: exploration in India
Kunjithapatham Dhileepan, Ayyapillai Balu, Syed Irfan Ahmed, Sangeeta Singh, Krishnakant Srivastava, Mariappan Senthilkumar, Selvaraj Murugesan, Ponnuswamy Senthilkumar, Mahadeo Gorain, Anamika Sharma, Naveen Sharma, Ramasamy Mahalakshmi and Roger Shivas   pp. 231-234
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Endophytes associated with Cirsium arvense – a step toward understanding their role in the success/failure of Sclerotinia sclerotiorum as a bioherbicide
Sarah Dodd, Rebecca Ganley, Stanley Bellgard and Daniel Than   pp. 235-238
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Natural enemies of the South American pampas grasses Cortaderia spp. in New Zealand
Stanley E. Bellgard, Chrisher J. Winks, Daniel J. Than and Cl�mence C. Aliaga   pp. 239-242
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A new attempt to introduce the lacy-winged seed fly Mesoclanis magnipalpis to Australia for biological control of boneseed Chrysanthemoides monilifera subsp. monilifera
Tom Morley   pp. 243-244
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Modelling Tradescantia fluminensis and the effect of biological control agents
Agate M. Ponder-Sutton, Alex James, Michael Plank, Shona Lamoureaux and David Kelly   p. 245
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Herbicide resistance

Risks and RATs: assessing glyphosate resistance risk in paddocks in north-eastern Australia
David Thornby, JeffWerth, Matt Curr and Steve Walker   pp. 246-249
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Managing glyphosate resistant weeds in Australia
Chrisher Preston   pp. 250-253
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Managing herbicide resistance in Southern Australian farming systems using Roundup Ready� canola
James E. Neilsen and Ian N. Taylor   pp. 254-257
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Spread of herbicide resistance alleles in Lolium rigidum Gaud. (annual ryegrass)
Jenna Malone, Peter Boutsalis and Chrisher Preston   pp. 258-261
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Manipulating the seed bank to manage herbicide-resistant weeds
Michael J. Widderick, Steven R. Walker and Andrew R. McLean   pp. 262-265
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Serrated tussock resistance to flupropanate in Australia – is the genie out of the bottle?
David A. McLaren, Charles J. Grech, Julio Bonilla, Kym Butler and Sethu Ramasamy   pp. 266-269
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Heritability of flupropanate resistance in Nassella trichotoma
Sethu Ramasamy, David A. McLaren, Chrisher Preston and Ann C. Lawrie   pp. 270-273
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A survey of southern New South Wales to determine the level of herbicide resistance in brome grass and barley grass populations
John C. Broster, Eric A. Koetz and Hanwen Wu   pp. 274-277
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New mode of action herbicides to combat herbicide resistant annual ryegrass (Lolium rigidum) in Australian cereal production
Peter Boutsalis, Gurjeet Gill and Chrisher Preston   pp. 278-280
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Genetic diversity among ALS-inhibiting herbicide resistant and susceptible populations of Sonchus oleraceus L. (sowthistle) in Australia
Robin S. St John-Sweeting, Chrisher Preston, Jeanine Baker, Steve Walker and Michael Widderick   pp. 281-284
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Herbicide-resistant weed seeds contaminate grain sown in the Western Australian grainbelt
Pippa J. Michael, Mechelle J. Owen and Stephen B. Powles   pp. 285-286
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New techniques

A model for state wide co-ordinated management of invasive cacti
Greg P.J. Patrick, Debra C. Agnew and David Cooke   pp. 287-290
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Integrated management of mown vegetation in eastern Australia
Sheldon C. Navie, Steve J. Hampton and Nick Bloor   pp. 291-294
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Weed trimming – a successful non-chemical seed bank reduction technique
Glen P. Riethmuller and Abul Hashem   pp. 295-298
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Smoking out the enemy: triggering agricultural weed seeds to germinate with karrikinolide
Rowena Long, Erin Griffiths, Jason Stevens, David Merritt, Kingsley Dixon and Stephen Powles   pp. 299-302
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Herbicide tolerance of three ornamental ground cover species: Polygonum capitatum, Sedum mexicanum and Soleirolia soleirolii
Chin Lui Foo, Kerry C. Harrington and Marion B. MacKay   pp. 303-306
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Aquatic

Endothall for aquatic weed control in New Zealand
Rohan D.S. Wells and Paul D. Champion   pp. 307-310
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Managing weeds in riparian zones
Fiona J. Ede, Nigel Ainsworth and Trevor D. Hunt   pp. 311-314
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Movement of triclopyr, picloram and aminopyralid down a river after blackberry spraying
John H. Moore, Brad Rayner and Bret Vukelik   pp. 315-317
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Manchurian wild rice (Zizania latifolia) biomass allocation and implications for control
Paul D. Champion and Deborah E. Hofstra   pp. 318-320
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Herbicide application creates stem fragments capable of dispersal and regeneration in aquatic alligator weed
Tony M. Dugdale, Daniel Clements, Trevor D. Hunt and Kym Butler   pp. 321-324
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National aquatic weeds program – the journey
Andrew R. Petroeschevsky and Philip L. Moran   pp. 325-328
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Unchecked growth of aquatic alligator weed (Alternanthera philoxeroides) over a 5 year period in a Melbourne pond
Daniel Clements, Tony M. Dugdale and Trevor D. Hunt   p. 329
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Triclopyr control of grey willow in New Zealand wetlands: initial field trials
Kerry A. Bodmin   pp. 330-331
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Forests

An assessment of the impacts of environmental certification on vegetation management in New Zealand plantation forestry
Carol A. Rolando, Jerzy Zabkiewicz, Michael S. Watt and Brian Richardson   pp. 332-335
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Preliminary evaluation of salflufenacil herbicide for New Zealand forestry use
Jerzy Zabkiewicz, Kevin D. Steele, Rodger Welsh, Graham Mackisack and Grant Hagerty   pp. 336-339
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Determining how soon ground covers can be planted in forests after applying metsulfuron
Kerry C. Harrington and X. Zhao He   pp. 340-343
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Use of an organosilicone surfactant to minimise spray application volumes for forestry scrubweed herbicides in New Zealand
Robyn E. Gaskin, Kevin D. Steele and Mark M. Geddes   pp. 344-347
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Characterisation of forest weed species and herbicide formulations to predict droplet adhesion and optimise spray retention
W. Alison Forster and Rebecca M. van Leeuwen   pp. 348-351
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The tolerance of Acacia species to herbicides
John H. Moore and GeoffWoodall   pp. 352-355
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Strategic management of the highly invasive Buddleja davidii within New Zealand in a changing climate
Michael S. Watt, Darren J. Kriticos, Karina J.B. Potter, Lucy K. Manning, Nita Tallent-Halsell and Graeme W. Bourd�t   pp. 356-359
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Will adult feeding damage rule out introducing Mecysolobus erro against buddleia into New Zealand?
Toni M. Withers, Belinda A. Gresham and Michelle C. Watson   pp. 360-363
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Rate of dispersal a key success factor for weed biological control agents within forest plantations
Michelle C. Watson, Michael S. Watt and Toni M. Withers   pp. 364-367
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Spatial and temporal patterns of exotic species recruitment in a cyclone-damaged tropical forest
Helen T. Murphy, Matt G. Bradford, Andrew J. Ford and Daniel J. Metcalfe   pp. 368-371
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Assessment of herbicides for selectively controlling broom (Cytisus scoparius) growing with Pinus radiata
Hop Tran, Kerry C. Harrington, Alastair W. Robertson and Michael S. Watt   p. 372
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Chemical profile differences in endemic parasitic weeds: a study of host-parasite chemical profiles in select mistletoe and eucalypt species
Aaron L. Preston, Min An and David M. Watson   pp. 373-374
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Eradication

White bryony (Bryonia cretica subsp. dioica) eradication response in New Zealand
Wendy Mead, Jaap Knegtmans and Tim Gilbertson   pp. 375-377
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Hybridisation within Chrysanthemoides monilifera and implications for the eradication of bitou bush from Victoria, Australia
R.J. Adair and K.L. Butler   pp. 378-381
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Continuing successful eradication of parthenium weed (Parthenium hysterophorus) from New South Wales, Australia
Philip J. Blackmore and Stephen B. Johnson   pp. 382-385
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A review of the marram grass eradication programme (1999-2009), Stewart Island, New Zealand
Michael J. Hilton and Teresa M. Konlechner   pp. 386-389
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Ammophila arenaria (marram grass) persistence through seedling recruitment
Teresa M. Konlechner and Michael J. Hilton   pp. 390-393
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Biodetection technology for rare plants
Rebecca J. Sargisson, Ian Popay, Ian G. McLean and Peter Crocker   pp. 394-397
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Pastures

New Zealand dryland pastures: effects of sown pasture species diversity on the ingress of unsown species
Katherine N. Tozer, Gary M. Barker, Catherine A. Cameron and Nadine Loick   pp. 398-401
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Herbicide tolerance of five young perennial grasses
John H. Moore, Arjen Ryder and Ronald Master   pp. 402-405
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Species-specific challenges for improving agrochemical spray performance on ryegrass
Amin K. Pathan and Robyn E. Gaskin   pp. 406-409
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Wild radish and toad rush control in Cadiz French serradella pastures
John H. Moore and Richard Snowball   pp. 410-413
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Optimising the control of rangeland woody weeds
Andrew F. Zull, Oscar J. Cacho and Roger A. Lawes   pp. 414-417
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Passage and survival of Acaciella angustissima (Mill.) Britton & Rose and Aeschynomene paniculata Willd. ex Vogel seed through the sheep gut
Chris Gardiner, Kendrick Cox, Carole Wright and Mark Keating   pp. 418-420
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Evaluating herbicides for the control of the invasive weed florestina (Florestina tripteris DC.)
Dannielle Brazier, John McKenzie, Ashley Owen, Shane Campbell, Joe Vitelli, Angela Reid and Robert Mayer   pp. 421-423
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Chilean needle grass

Current and potential distributions of Nassella neesiana (Chilean needle grass) in Australia and New Zealand
Graeme W. Bourd�t, Shona L. Lamoureaux, Darren J. Kriticos, Michael S. Watt and Matthew Brown   pp. 424-427
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Detection, quantification and management of the dispersal of Nassella neesiana (Chilean needle grass) seeds in hay bales
Sandra Weller, S.K. Florentine, G.J. Ambrose, C.J. Grech and D.A. McLaren   pp. 428-430
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Chilean needle grass (Nassella neesiana) in the native grasslands of south-eastern Australia: biodiversity effects, invasion drivers and impact mechanisms
Ian G. Faithfull, Colin Hocking and David A. McLaren   pp. 431-434
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Environmental weeds

The review of the Department of Conservation’s strategic plan for managing invasive weeds
Ann Thompson   pp. 435-436
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Restoration and resilience in weed-invaded ecosystems
Hillary Cherry, Peter J. Turner and Kris French   pp. 437-440
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Eliciting stakeholder perceptions to help improve national weed management programs
Bo M. Raphael and Jeanine Baker   pp. 441-444
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Monitoring protocols to assess the recovery of native plant species following the control of widespread weed species
Paul O. Downey and Nelika K. Hughes   pp. 445-448
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Native species outgrow post-cyclone weeds
D.J. Metcalfe, H.T. Murphy, M.G. Bradford and A.J. Ford   pp. 449-451
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Herbicide control of summer-active perennial weeds in southern Australia
Rex Stanton, Hanwen Wu and Deirdre Lemerle   pp. 452-454
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Is garden waste dumping really a problem?
Susan M. Timmins, Alex James, Joseph Stover and Mike Plank   pp. 455-458
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Stem injection: a control technique often overlooked for exotic woody weeds
John McKenzie, Dannielle Brazier, Ashley Owen, Joe Vitelli and Bob Mayer   pp. 459-461
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Managing weeds for biodiversity conservation using an asset-based approach
Peter J. Turner, Leonie K. Whiffen, Mark A. Hamilton and Paul O. Downey   p. 462
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Do mutualists matter? The significance of pollinators, seed dispersers and rhizobia on the differential success of Acacia species in New Zealand
Elizabeth M. Wandrag, Andy Sheppard, Richard P. Duncan and Philip E. Hulme   p. 463
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How do propagule pressure, climate and land use interact to determine weed abundance and distribution on Banks Peninsula?
Federico Tomasetto, Richard P. Duncan and Philip E. Hulme   pp. 464-465
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No impact of the invasive plant Hieracium lepidulum on montane plant communities at two spatial scales
Ross Meffin, Alice L. Miller, Philip E. Hulme and Richard P. Duncan   p. 466
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Replacement of woody weeds by native plant succession in New Zealand
Kate G. McAlpine   p. 467
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New interactive keys to New Zealand weeds
Murray I. Dawson, Sheldon C. Navie, Trevor K. James, Peter B. Heenan and Paul D. Champion   p. 468
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Bushcare weed control of Coolatai grass (Hyparrhenia hirta) in Cobbler Creek Recreation Park, Golden Grove SA, Australia
Joshua Noble   p. 469
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Biosecurity

How well are we currently dealing with contentious plants?
Margaret H. Friedel, Tony C. Grice, John R. Clarkson, Keith Ferdinands and Samantha A. Setterfield   pp. 470-473
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The role of legislation and policy in dealing with contentious plants
John R. Clarkson, Tony C. Grice, Margaret H. Friedel, Samantha A. Setterfield and Keith Ferdinands   pp. 474-477
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Strategic use of weed legislation to limit the spread of weeds in NSW
Paul O. Downey and Stephen B. Johnson   pp. 478-481
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Embedding economics in weed risk management to assess contentious plants
Keith B. Ferdinands, Samantha A. Setterfield, John R. Clarkson, Anthony C. Grice and Margaret H. Friedel   pp. 482-485
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Containment as a strategy for tackling contentious plants
A.C. Grice, J.R. Clarkson, M.H. Friedel, K. Ferdinands and S. Setterfield   pp. 486-489
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National interest pest responses: responding to established pests of national interest
Jaap Knegtmans and Victoria Lamb   pp. 490-492
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Evolution, not revolution: getting stakeholders on board with the roll out of the National Post-Border Weed Risk Management protocols in New South Wales
Stephen B. Johnson and Scott A. Charlton   pp. 493-496
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The challenge of maintaining a robust on-going weed spotters network in Queensland
Kathy Stephens   pp. 497-500
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