New weed species and resistance problems in 2012 are the ecosystem's response to our substantial changes in agronomy and weed management over the last two decades.

The introduction of glyphosate tolerant cotton has significantly improved the

flexibility and management of a number of problem weeds in cotton systems.

Stopping seed-set on weeds that have survived a treatment of glyphosate is an important part of an IWM approach to preventing the development of glyphosate resistance.

Herbicide resistance is an ever increasing hurdle for sustainable agriculture, not only in Australia but worldwide.