Just a note about Spotlight plus tm (a Group G Herbicide) the replacement for Hammer as a spike for broadleaf weed control.
Looking at the Spotlight tm label the first rate you see is 300ml/100lts – This is for de-suckering grapevines!
Do not use that rate when spraying weeds!
The spike herbicide rate is similar to Goal an alternative spike herbicide also commonly used.
Spotlight = 40ml/100lts
This gives a recommended per hectare usage of between 100ml to 300ml/hectare.
Derek Cameron says, "Use 4 x the previous Hammer rate." Derek also says, "be careful using Spotlight as a spike with Jaguar (a Group C/F Broadleaf Selective Herbicide) as the Spotlight makes the Jaguar work too well and begin to affect your covercrop."
As always read the label for more information.