Per the product label for spot treating Turflon Ester Ultra, there is not a set rate per amount of water so we are unable to provide per a quart of water. You would mix 3/8 to 3/4 fl oz per 1000 sq ft in enough water to provide uniform coverage of the target area.
Turflon Ester Ultra must be applied at a rate of 1/2 to to 1 quart per acre to control kikuyu grass. You may also use it at .37-.73oz per 1,000 square feet in a gallon of water if that gallon covers 1,000 square feet. Otherwise, you would need to calibrate your sprayer. Three to four additional applications at 4 to 6 weeks intervals may be required to achieve control of the kikuyu grass.
Please view the full product label for more information.