With glyphosate resistant annual ryegrass now confirmed at 87 sites across Australia, the fight against it is becoming increasingly urgent.
It's a fight that's being strongly supported by the Grains Research and Development Corporation (GRDC).
Andrew Storrie, weed consultant with Agronomo and member of the GRDC supported Australian Glyphosate Sustainability Group, says fence lines and firebreaks can harbour resistant ryegrass, posing a problem because harvest and seeding equipment can drag weeds into the cropped area.
"Tillage and competition are difficult to employ on fences, so herbicides are the most likely option," Mr Storrie said.
"Paraquat, diuron and simazine can control resistant and susceptible annual ryegrass.
"While a handful of resistant plants can become a problem if nothing is done, resistance needn't be a problem if growers do some planning and remain observant," he said.
