Few months late on my questions but what's a good pre-emergent weed control for zoysia? Secondly, what's a good spot treatment spray for weeds that make it through?

New sod or established?

All depends on the weeds you're dealing with. Celsius is a pretty broad post emergent that is labeled for almost broadleafs and quite a few grassy weeds. You can buy packets that make a gallon or buy a bottle of it to last you a really long time. The problem with the packets is they're usually a really high rate so spraying it during the heat of the summer can cause some damage. With the bottle you set the rate.

Established. And no idea what kind of weeds, other than huge variety