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Posted on 7/25/15 at 10:27 pm to Marineaux
Vantage is an "over the top" herbicide designed to kill grass in landscaped beds. Vantage isn't that effective for torpedo grass anyway. Ron Strahan with the LSU AgcenterBR calls torpedo the lawn killer because there aren't selective herbicides that will kill the torpedo without killing the most common grasses in La., centipede and St. Aug. RoundUp concentrate applied directly to the centipede knocks it back pretty good but the roots have tons of carbohydrate storage so starving the plant by killing the blades is time consuming. It usually takes several months and isn't always 100%. That's why we change the grass species so we can spray. Unfortunately like the posters said before, there is no easy fix.
Posted on 7/25/15 at 10:32 pm to Daponch
Posted on 7/26/15 at 5:40 am to Daponch
Well done 
Posted on 7/26/15 at 10:45 am to AlxTgr
the top pic is definitely Torpedo grass. the bottom 2 are not. been fighting Torpedo for 25 years. the only way is to dig it out from the root when it first appears in your lawn. I think having a lawn service just spreads this crap everywhere
Posted on 7/26/15 at 12:58 pm to Nodust
i seeded with centipede this spring but have bahia and just about every weed known to man mixed in. right now i'm just trying to get all the dirt to fill in with something green. i may hit my yard up with some vantage and a broadleaf killer early next year and then heavily over seed with more centipede. i have way too much yard for sodding to be affordable. any suggestions from yard guys would be appreciated.
Posted on 7/26/15 at 2:29 pm to Nodust
thanks, but I know what torpedo grass looks like. I can spot that sheet from 25 ft away when it tries to pop up in my lawn. only success I've had is digging it out from the roots. Usually grows in a straight line about 12 in deep. tough to fight if your neighbors don't know or care
Posted on 7/26/15 at 3:01 pm to SharpDressedMan
Centipede will take over.
Although you will rarely see an extension person recommend fertilizing centipede with nitrogen I have found that seeded centipede responds well the first year or two to high nitrogen applications.
I would hit with about 2 lbs of 34-0-0 or 33-0-0 per 1000 square feet of yard now and keep it well watered. That will make all the grass grow including the bahia so to counter that I would mow lower and more frequently than usual. Do that through the end of the year and see if that centipede stand doesn't get better. Do not apply high nitrogen fertilizers once the centipede sod is thick and established.
Centipede can take mowing that other grasses cant. The bahia will be the hardest thing to get rid of and may require glyphosate applications to get rid of.
In January I would apply this--- Surflan--it will prevent crabgrass and bahia seed from germinating. It acts as a pre-emeragant on several broadleaf weeds too. It also stops sand burs.
Although you will rarely see an extension person recommend fertilizing centipede with nitrogen I have found that seeded centipede responds well the first year or two to high nitrogen applications.
I would hit with about 2 lbs of 34-0-0 or 33-0-0 per 1000 square feet of yard now and keep it well watered. That will make all the grass grow including the bahia so to counter that I would mow lower and more frequently than usual. Do that through the end of the year and see if that centipede stand doesn't get better. Do not apply high nitrogen fertilizers once the centipede sod is thick and established.
Centipede can take mowing that other grasses cant. The bahia will be the hardest thing to get rid of and may require glyphosate applications to get rid of.
In January I would apply this--- Surflan--it will prevent crabgrass and bahia seed from germinating. It acts as a pre-emeragant on several broadleaf weeds too. It also stops sand burs.
This post was edited on 7/26/15 at 3:04 pm
Posted on 7/26/15 at 9:39 pm to I B Freeman
Thanks for all the tips. I'll definitely look into the pre-emergent as I haven't had an easy time finding a product like that. I will also keep at it with the Vantage to suppress as best I can. I think Gevans has it pegged. It appears that it is spreading to my yard from a neighbor's yard, and that neighbor has a lawn service. This neighbor also doesn't seem to care near as much about the lawn as I do, so even if I get it controlled in my yard, I suppose it'll never be truly suppressed.
Posted on 7/27/15 at 5:35 am to Marineaux
Sorry I was replying to sharpdressed about his newly seeded centipede
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