Weedsmart Podcast

Serious herbicide resistance news has come out of South Australia, with a population of ryegrass from the Eyre Peninsula, having been confirmed resistant to all of the pre-emergent herbicides – Avadex, Arcade, Trifluralin, Propyzamide and Sakura, as well as two lesser-known herbicides EPTC and Thiobencarb. It was sampled in 2014 just two years after the release of Sakura in Australia. Metabolic cross-resistance is at play here. The really serious news is that a random survey in the South East of South Australia found many more populations of ryegrass with multiple cross-resistance to a range of pre-emergent herbicides, and the perplexing thing is that there is no predictable cross-resistance pattern.This is the research by the team of Chris Preston, Peter Boutsalis, David Brunton and Gurgeet Gill from the University of Adelaide with GRDC investment and we speak with Chris Preston about the findings and what they mean. If you'd like to learn more about the technical side of this finding, you can read AHRI