Is there a spraying to kill carpet grass in my couch lawn

Unfortunately, we do not have a selective weed spray in our range to kill carpet grass in couch lawn.  We recommend applying Zero with caution, masking the couch lawn with cardboard to help protect it from overspray form the Zero.

Try 'Yates Zero Weedkiller Super Concentrate' as a spot spray, or paint on with the 'Yates Zero Weeding Brush'. Please use caution when using the weedkiller near other plants/lawn, because everything that it touches could potentially kill. 

Please click on the following links for further info on these products:

'Yates Zero Weedkiller Super Concentrate'- https://www.yates.com.au/product/garden-weed-control/general-garden-weed-control/yates-zero-weedkiller-super-concentrate

'Yates Zero Weeding Brush'- https://www.yates.com.au/product/garden-weed-control/general-garden-weed-control/zero-weeding-brush