I have been doing this for a few years now and my business is really growing. I have had great sucess following the labels, but as I am getting bigger I am also trying to cut cost. So here is an example of my question.... Let's say you are targeting broadleaf weeds using speedzone southern or any 3-way/chemical. The rate for warm season grasses is 0.75-1.5oz/1000 and cool season is 1.5-2.2 oz/1000. So my question is if .75 oz will kill broadleafs in warm season why wouldn't it work on cool season? Can I assume that the rate is geared more towards the tolerance of the turf to the chemicals? There would be a big difference in cost of .75 oz vs 2.2 oz.