Dr Michael Walsh from the Australian Herbicide Resistance Initiative travelled the
entire cropping zone of Australia comparing Harvest Weed Set Control (HWSC)
tools at 24 sites in wheat crops. In this research, Michael measured ryegrass seed
set. On average, across all of the 24 sites there were 10 ryegrass plants per square
metre in crop, and they set an average of 210 seeds per plant
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