PreDicta B

Cereal root diseases cost grain growers in excess of $200 million a year in lost production. Much of this can be prevented.

PREDICTA B (B = broadacre) is a DNA-based soil testing service to assist grain producers to identify which soil-borne pathogens pose a significant risk to their  crops prior to seeding so steps can be taken to minimise risk of yield loss.

It is critical to use the correct soil sampling protocol. Download these guides to learn more about sampling protocol:



Access PREDICTA B testing service

Growers can access PREDICTA B through a SARDI accredited agronomist. They will organise sampling, interpret the results and give advice on management options to reduce your risk of yield loss.

SARDI Molecular Diagnostic Centre processes PREDICTA B samples weekly between February to mid-May prior to crops being sown. Samples are processed less frequently throughout the rest of the year .

Contact Nigel Percy for accredited consultants near you.

PREDICTA B certification courses

At least one accreditation course (one day) is delivered in each cropping region between late October to early December in most years.

Venues are announced in September.

To register interest in attending a course contact Nigel Percy.

Completing the course will enable consultants to:

  • deliver PREDICTA B to their clients
  • download the latest e-version of the Broadacre soilborne disease manual.

Contact Dr Alan McKay for more information.

Download the course flyer (PDF 2.9 MB)


The maps below show PREDICTA B sample results mapped to the nearest town. The area of the circle is proportional to the number of samples mapped to the town.

The pie within each circle represents the proportion of samples falling into each category:

  • Below detection
  • Low
  • Medium
  • High.

Disease risk maps

Population density maps


Interpreting results:

Dr Alan McKay
Research Leader, Soil Biology and Diagnostics
Phone: (08) 8429 2216

Sample kits, sample tracking, course registration of interest:

Russell Burns
Phone: (08) 8429 2238
Mobile: 0401 122 115

Nigel Percy
Phone: (08) 8429 2236

Sample delivery

SARDI Molecular Diagnostics Group
Plant Research Centre
2B Hartley Grove
Urrbrae SA 5064

Page Last Reviewed: 08 Nov 2017
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