Eric Koetz

Research interests

  • Impact of weeds on southern cropping systems
  • Identify hard to control weeds in cotton farming systems
  • Annual weed survey of cotton farming systems and early detection of emerging weeds
  • Herbicide resistance status of weeds in cotton farming systems, screening for Glyphosate and Group A resistance


Eric Koetz has over 20 years experience working in crop and pasture agronomy in southern NSW farming systems. He joined NSW DPI in 1996 after working with CSIRO from 1990 to 1996 on break crops and nitrogen management of cereals.

With NSW DPI, Eric initially worked on lucerne establishment in mixed-farming systems and evaluating a range of grasses (native and exotic) for low rainfall environments.

From 2000, he worked on integrated weed management including six years with the CRC for Australian Weed Management.

Eric’s research from 2008 to 2012 focused on herbicide resistance and involved three surveys across southern and central NSW identifying resistance levels to the major herbicide groups.

From 2012 to 2014, Eric was responsible for the pulse agronomy trials in southern NSW assessing the use of brown manuring in cropping systems and its role in controlling resistant weeds as well as the benefits of increased nitrogen and soil water from manured pulses to the following crops.

Eric has spent the past two years as a Research Agronomist working on cereals in Southern Farming Systems. Eric’s current role is as a weeds agronomist in cotton farming systems at the Wagga Wagga Agricultural Institute.


  • Bachelor Applied Science, University of Canberra, 1989

Current projects

  • Hard to control weeds in cotton farming systems

Recent publications

Deirdre Lemerle, David J. Luckett, Eric Koetz, Trent Potter and Hanwen Wu

Seeding rate and cultivar effects on canola (Brassica napus) competition with volunteer wheat (Triticum aestivum). Crop and Pasture Science, In Press (July 2016)

Eric Koetz, Karl Moore, Barry Haskins, and Peter Martin(2015) The effect of fertiliser placement and row spacing on plant establishment and grain yield of three broad leaf (Lupinus albus) and three narrow leaf (L. angustifolius) lupin varieties. Australian Agronomy Conference, Hobart

Deirdre Lemerle, David J. Luckett, Peter Lockley, Eric Koetz and Hanwen Wu

Competitive ability of Australian canola (Brassica napus) genotypes for weed management. Crop and Pasture Science, Vol 65 No 12 2014

Eric Koetz, Luke Gaynor, Eric Armstrong, and Gerard O’connor. (2014) Pulses – new varieties and new management  bring new options. GRDC Grains Research Updatre, Temora, February 11-12 2014.

John C. Broster, Eric A. Koetz, Adam J. Shephard and Hanwen Wu(2014) Extent of herbicide resistance in three broadleaf weed species in southern New South Wales. Nineteenth Australasian Weeds Conference. 282-285

Eric Koetz, Karl Moore, Barry Haskins, Neil Coombes and Peter Martin(2014) Canola variety interaction with nitrogen placement. ARAB Conference, Tanunda, South Australia.

Lemerle, D, Lockley, P, Koetz, E & Diffey, S 2013, ‘Herbicide efficacy for control of annual ryegrass (Lolium rigidum Gaud.) is influenced more by wheat seeding rate than row spacing’, Crop & Pasture Science, vol. 64, no. 7, pp. 708–715.

Broster JC, Koetz  EA & Wu, H 2012, ‘Herbicide resistance frequencies in ryegrass (Lolium spp.) and other grass species in Tasmania’, Plant Protection Quarterly, vol. 27, issue 1, pp.36–42: www.weedinfo.com.au/ppq_abs27/ppq_27-1-36.html

Broster  JC, Koetz EA & Wu, H 2011, ‘Herbicide Resistance Levels in Annual Ryegrass (Lolium rigidum Gaud.) in Southern New South Wales’, Plant Protection Quarterly, vol. 26, issue 1,
pp. 22–28; www.weedinfo.com.au/ppq_abs26/ppq_26-1-22.html

Broster  JC, Koetz EA & Wu, H 2011, Herbicide Resistance in Wild Oats (Avena spp.) in Southern New South Wales,Plant Protection Quarterly, vol. 26, issue 3, pp. 106–110; www.weedinfo.com.au/ppq_abs26/ppq_26-3-106.html

Contact details

Email: eric.koetz@dpi.nsw.gov.au
Location: Wagga Wagga Agricultural Institute