Impact of crop species and crop sequencing on nematode, crown rot and common root rot inoculum loads

Andrew Verrell1, Jeremy Whish2, David Lawrence3, Lindsay Bell2, Darren Aisthorpe3, Jon Baird1, Jayne Gentry3, Greg Brooke1, Andrew Erbacher3, Andrew Zull3, Kaara Klepper4

1NSW Department of Primary Industries, Tamworth, NSW, 2340,

2 CSIRO Agriculture, St Lucia QLD 4067

3Qld Department of Agriculture and Fisheries, Toowoomba, Qld, 4350

4 GRDC Toowoomba Qld 4350



Farming systems are underperforming in terms of water limited yield potential, due to challenges that include declining soil fertility, herbicide resistant weeds and increasing soil pathogens. Seven long term farming systems sites were established in 2015 across different environments from Trangie to Emerald to investigate how modifications (cropping intensity, legume frequency, cropping diversity and nutrient management strategies) to cropping systems will impact on their performance. Four major pathogens; root lesion nematodes, (Pratylenchus thornei and Pratylenchus neglectus), crown rot (Fusarium pseudograminearum) and common root rot (Bipolaris sorokiniana), were monitored, using the PREDICTA® B DNA-based soil test, across the sites and crop sequences. The effect of individual winter and summer crop species and their combined effect in a range of crop sequences, on the changes in DNA pathogen loadings, are reported.


The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

Photo Credits

David Marland Photography Graham Centre for Agricultural Innovation, Charles Sturt University

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