The GRDC now have 36 weed management videos on YouTube http://www.grdc.com.au/IWM-videos starting with the importance of weed seed capture at harvest and working through to use of double knock techniques to control hard-to-kill weeds.
The final five videos are clear explanations by Bill Gordon, spray application consultant, on how to make sure the herbicide gets to the target with sufficient coverage to maximise weed control and not waste your money.