As seems to be the general consensus this year the dandelions are thick as ever.. . In the past I've had reasonaby good luck with spot spraying, but would like to improve... What is an effective, easily available Pre M and Post M? Ideally I'd like to spray a blanket application in the fall, and another (if needed) in the spring. I have a tractor supply store and Lesco available. Where do Trimec and Speedzone fit into the above? Also can someone give me a ballpark price on those sprayers that fit into your walk behind spreaders?