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What's the difference ?

bsmith0023 (z8b coastal SC)

9 years ago

Went by the store today and found Spectracide for St Augustine / Centipede grass ( http://www.spectracide.com/solutions/weed-and-grass-killers/lawn-weed-killers/spectracide-weed-stop-for-lawns-for-st-augustine-centipede-lawns-concentrate-ready-to-spray.aspx ) then I saw Spectracide ( http://www.spectracide.com/Solutions/Weed-And-Grass-Killers/Lawn-Weed-Killers/Spectracide-Weed-Stop-For-Lawns-Concentrate-Ready-to-Spray.aspx )

They both clearly state they work for Centipede, and although the website doesn't say it, the regular bottle said St Augustine too.. the bottle for just centipede/st Augustine was $10 but the bottle for all grass was $5..

Is the $5 bottle really safe for Centipede and St Augustine ?? $5 is not a lot but I just want to understand why there are two variations and the version that only works on two types of grass is double the price!

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Comments (2)

dchall_san_antonio
9 years ago
The purple label contains atrazine as the active ingredient. Atrazine kills almost all plants with the exceptions of centipede and St Augustine grasses. If you have the Floratam variety of St Augustine, this is the only herbicide that does not harm the grass. Atrazine is nasty stuff, so reread the directions a couple times. Walk backwards when you apply so you don't have to walk through it. Apply once in April to control just about everything. If you really need to apply again, wait until September.

The green label can damage Floratam. It is the standard type of 2,4-d herbicide equivalent to the formula of standard Weed-b-Gon.
bsmith0023 (z8b coastal SC) thanked dchall_san_antonio
bsmith0023 (z8b coastal SC)
Original Author
9 years ago
So the purple label is the "safest" if i don't know exactly what type of St. Augustine i have ?
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