Embark Turf and Ornamenal Growth Regulator would be a good option for you. Embark T&O provides turf management professionals with an efficient means of reducing the rate of growth and volume of clippings by 50% or more and inhibiting unsightly seedheads. This is labeled for zoysia grass. The mixing ratio is 8 fl. oz. per 1000 square feet.
Embark Turf and Ornamental Growth Regulator is labeled to be use on Elaeagnus species plants. Per the product label, use 6.5 fluid ounces per gallon of water. Be sure to read the label completely before application.
The rates for Embark Turf and Ornamental Growth Regulator are going to vary depending on the program you are using and what type of area you are treating. Please refer to the product label for complete instructions on your application area/use.