In this thread, I determined that the weed I'm trying to kill is Horseherb (has a picture of my lawn for ref)
www.lawnsite.com
I found this product which was the only herbicide at Lowes that was labelled for killing clover on St Augustine (other than Roundup for Lawns, which seems to have the same ingredients for a higher cost). Seems to be a broadleaf post-emergent herbicide. But it doesn't list Horseherb or Cinderella Weed in the long list of weeds killed in the pull-out label; I can't find any that list it even online.
www.imageforweeds.com
Seems to have the 2,4D and most other ingredients that 3-way has, diluted to consumer strength, perhaps diluted more for St. Ag.
I'm thinking to try this on a small area and see how it works at killing the Horseherb without killing the Bermuda. I'm going to avoid the new St Ag sod for now since it's labelled for "established grass", but the intention would be to use it on the St Ag too in a few months.
One question is how the temperature sensitivity works... the label says "Apply when daytime temps are betw 45 and 90 degrees. Do not apply this produce to St Ag when the temp is above 85 degrees unless temp turf injury can be tolerated."
In my area (Austin, TX) the afternoon highs are typically in the mid 90s right now, but mornings are much less (say 75 degrees). Does this mean I'm okay to apply on a cool morning, or should I wait until after summer?
Help identify and kill this weed ... clover?
I couldn't find this weed in my yard on Turfgrass Weeds | AggieTurf so I am asking if anyone can help me figure out what pre herbicide would get it. This choking the Bermudagrass, but I have St. Augustine sod adjacent so ideally a herbicide that works on both would be great, although different...
I found this product which was the only herbicide at Lowes that was labelled for killing clover on St Augustine (other than Roundup for Lawns, which seems to have the same ingredients for a higher cost). Seems to be a broadleaf post-emergent herbicide. But it doesn't list Horseherb or Cinderella Weed in the long list of weeds killed in the pull-out label; I can't find any that list it even online.

Image for Weeds Southern Lawn Weed Killer for St. Augustinegrass and Centipedegrass Concentrate
Contains multiple active ingredients to provide excellent broadleaf weed control in established warm-season and cool-season grasses. Weeds controlled include dandelion, chickweed, clover, dollar weed and spurge.

Seems to have the 2,4D and most other ingredients that 3-way has, diluted to consumer strength, perhaps diluted more for St. Ag.
I'm thinking to try this on a small area and see how it works at killing the Horseherb without killing the Bermuda. I'm going to avoid the new St Ag sod for now since it's labelled for "established grass", but the intention would be to use it on the St Ag too in a few months.
One question is how the temperature sensitivity works... the label says "Apply when daytime temps are betw 45 and 90 degrees. Do not apply this produce to St Ag when the temp is above 85 degrees unless temp turf injury can be tolerated."
In my area (Austin, TX) the afternoon highs are typically in the mid 90s right now, but mornings are much less (say 75 degrees). Does this mean I'm okay to apply on a cool morning, or should I wait until after summer?