How much spectracide for one gallon of water?

The maximum application rate of Spectracide for every 1000 square feet of grass is 6.4 ounces per gallon of water. Adjust your concentrations accordingly to the size of your lawn and the amount of water used. For instance, if you are treating 500 square feet of grass, the concentration is 3.2 ounces per gallon. If you are treating 2000 square feet of grass, use 12.8 ounces of Spectracide per gallon.