Mecroprop (MCPP) for St. Augustine

I noticed that a weed control ready to use bottle stated it would be safe for use on St. Augustine since MCPP was one of the ingredients. However, i was reading a Scott's weed and feed lawn fertilizer bag whch contained MCPP and it said it was not safe to use on St. Augustine. The percentage of MCPP in the bag was higher than in the ready to use bottle.Could the higher percentage of MCPP be the reason it couldn't be used on St. Augustine? Or maybe because it is used with the fertilizer and subjected to burning?
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