South East Queensland farmer Engelbert Krampl first encountered glyphosate resistant barnyard grass in his cropping system in the summer of 2008-09.

Nutgrass (Cyperus rotundus L.), a plant native to India, is known as the world's worst weed .

A disease can only occur when a virulent pathogen contacts a susceptible host under favourable environmental conditions. The incidence and severity of a disease reflects the occurence of these three factors.