Answer: Scott's Bonus S Weed and Feed for Southern Lawns is saft to use on your St. Augustine so the yellow is not caused by the product, unless it was over applied or it was not watered in well. I can't diagnose the yellowing grass blades - give them another week or 10 days to green up. If they don't, you may be dealing with a fungus disease. Wish I could offer more assistance.
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