Atrazine after weed/feed?

firstbase

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May 26, 2013
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I have a South Florida St. Augustine lawn. I put down Andersons .48 Barricade pre-emergent a month ago. 2 weeks ago I put down St Augustine weed and feed. Have some dying off of smaller weeds, mostly some variety of Sedge and other types. HAsn't touched the dollar weeds at all. Would like to put down some Atrizine but don't want to overdo the weed killer and hurt the grass. Am I going too far with weed killer by applying the Atrazine? Any comments appreciated.
 
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