Charles Sturt University
Graham Centre for Agricultural Innovation

The latest herbicide resistance survey

Graham Centre researchers have been ‘putting in the kilometres’ as part of the national research effort to track herbicide resistance.

Over six weeks from October to December 2020 they were busy collecting samples for the latest Grains Research and Development Corporation (GRDC) national herbicide resistance survey.

photo of sampling in a wheat crop west of DeniliquinA team of six people visited 411 paddocks between Wentworth in western NSW to Dubbo in central NSW, via Wagga Wagga.

From these paddocks 814 samples were collected of six different weed species; annual ryegrass, wild oats, brome grass, barley grass, wild radish and sow thistle.

At the same time teams from other institutions were also conducting surveys across the remainder of the Australian cropping region from Western Australia to Queensland.

Graham Centre researcher, Dr John Broster, said it’s a new approach to monitoring herbicide resistance.

“Unlike previous surveys, where paddocks were chosen at random, for this survey all co-operating farmers were contacted by phone beforehand and farm maps collected before sampling was undertaken,” Dr Broster said.

“Although herbicide resistance surveys have been conducted across the entire cropping region before this is the first where the methodology has been the same for all institutions across all phases of the project - starting with sample collection.”

In the previous surveys all samples collected by an institution were screened for resistance at that institution.

For this project all samples of a weed species will be screened by the one institution and Charles Sturt University will be screening the wild oat and sow thistle from across Australia.

GRDC Project details: UCS2008-001RTX. Determining the Incidence of herbicide resistance in Australian grain cropping  

Other institutions: University of Adelaide, University of Western Australia, University of Sydney, Queensland Department of Agriculture and Fisheries


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