A maintenance plan consisting of fertilization & nutrition management can get your desirable grass in better shape.
Wiregrass thrives in a hot, dry environment & it loves Nitrogen in the heat of the Summer. Do not apply any synthetic fertilizer on top of your Cool Season grass in the middle of the summer as it will generate growth on the Wiregrass.
An organic fertilizer can be put on the lawn at this time, as it needs the soil temperatures to break it down. Cool Season Grasses go dormant in the hottest part of the summer. Leaving your lawn blondish brown & dry.
Do not attempt to revive your cool season grass in this period as it is not actively growing.