Pre-emergent herbicide resistance has been confirmed in ryegrass

RESISTANCE to pre-emergent herbicides from three mode-of-action groups has now been confirmed in Australian annual ryegrass populations.

National weed resistance surveys of growers’ paddocks have identified populations resistant to the Group D, Group J and Group K herbicides and combinations of these herbicides.

Herbicide resistance expert Dr Chris Preston from the University of Adelaide said the resistance situation was complex, involving a variety of patterns of resistance.

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