REQ: How can I get rid of Bahaya grass

It's mixed all in the St Augustine so I can't just kill all of it.. over an acre lot, any help appreciated.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.