I am a homeowner in central Fla., zone 9a. I am trying to handle my own weed/pest control and would appreciate your thoughts on the following ( if I cannot get the turf to at least start improving by summer, I will return to a professional, but I want to at least try myself first !!) Location - Daytona area Turf - Floratam St.Augustine H2O- once weekly, 30 mins. per zone (will increase in summer rains) Light - all areas of yard receive partial to all-day sun Misc.- we have voles/moles, but they're not an issue now Weeds - oxalis, dandelions, a little nutsedge Spreader - Scotts Accugreen 3000 drop I applied granular pre-emergent (Dimension 0.21 0-0-7 from Lesco) on 6 March '10. I'm still seeing a huge amount of oxalis and dandelions in our Floratam St.Aug., and I would like to know how soon I can apply Lesco Atrazine 0.92 20-0-10....or if it's perhaps too late? I have been trying to pull the weeds by hand w/ out harming the turf runners, but it's a challenge. Our yard is approx. 50-60% infested. We have several bare patches that I'll be plugging in May. Any advice is appreciated.