Relax no harm done. Don't do anything until you see it all greened up. At that point then you can fertilize, wait 10 weeks then apply your last fertilizer application for the season.. Well in Florida you can apply a 3rd application 10 weeks later if really needed but I do not advise it. What kind of Zoysia is it. Do you know?

Thank you for the response. It is Empire Zoysia. We bought a foreclosure last January, and decided to install Empire Sod over the entire yard (in place of the current mud). Last year by mid-summer the yard look incredible. Then in December is started to turn to straw...chuckle...but that was already expected. Things were going like clock work, until Monday night. At least that was my fear until reading your response.

I had cut it down to two inches, but was still fear full of cutting it to what I am reading is 1 inch. Thoughts on cutting it that low?

OK sounds like you have been maintaining your Empire Zoysia too high to start with because the recommended cutting height is 1 to 2 inches. So armed with that info cut no higher than 2 inches, and no lower than 1 inch with a rotary mower.

Relax when you see it starting to green up apply some slow release urea 15-10-5 fertilizer at a rate 6 pounds of product per 1000/ft2. Be careful with Zoysia not to kill it with kindness by applying too much fertilizer. You only need two application per growing season. If you push too much fertilizer on it will cause excessive thatch problems which leads to insect, disease, and fungal problems all of which can kill the grass.

With Zoysia it is a good idea to de-thatch your lawn once a year as it tends to be a heavy thatcher. The grass blades are very tough, and the clippings decay very slowly. Keep your mulch mower blades sharp so it chops up the clippings into little pieces. So keep your eye out for thatch.