I found that a herbicide called Atrazine works well for broadleaf weeds and does not harm the St. Augustine. I buy it online at Domyown.com. Mix in a hand bottle sprayer for spot treatments. And I use a pre-emergent in April and Nov as I was instructed by the UF agriculture extension agent (Master Gardener) at Sumpter County to prevent new weed seeds from sprouting. Comes in granules and spread like fertilizer. My lawn is doing much better now.
I attached a lawn care guide that the UF lady sent to me.
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