has any product proved successful in controlling richardia weed in buffalo lawn since Yates posting in 2012

Thank you for contacting Yates. 

Unfortunately, we do not have any registered product for controlling Richardia in lawn. You may try spot spray with Yates Zero Rapid 1-Hour Action Weedkiller which is a contact herbicide. Take care when applying as it will kill any plants it contacts. Click here for more info: https://www.yates.com.au/product/garden-weed-control/general-garden-weed-control/yates-zero-rapid-1-hr-action-weedkiller