According to table 3 on page 14 of the QuinKill Max Crabgrass Label:
For broadcast applications mix 64 fl ozs of product per acre.
For Spot applications, mix 1.45 fl ozs per 1000 sq ft. The amount of water is determined on how much it takes to cover a 1,000 sq ft area.
One Pint controls up to 10,000 sq ft or 1/4 of an acre
One Quart controls over 20,000 sq ft or 1/2 of an acre
One Half Gallon controls over 40,000 sq ft or 1 acre
Use 1.5 oz (3 Tbsp) per gallon for spot treatment
Yes, QuinKill Max Crabgrass and Weed Killer is safe for established fescue grass (except for fine fescue) if used as directed on the product label.
QuinKill Max is not labeled to control Sisyrinchium. Atrazine is often used to control this plant in St. Augustine or Centipede turf. In other warm-season turf, you may have success with herbicides containing Trimec such as Fertilome Weed Free Zone. You can also always use a non-selective herbicide such as RoundUp QuikPro and just spot treat the areas where you find the blue-eyed grass.
You could use a post-emergent to control it or you could even use a pre-emergent product called Dimension which also has very early post emergent crabgrass control. For post emergent, QuinKill Max would be a good choice to use.
QuinKill Max Crabgrass and Weed Killer is not labeled to kill poa annua, or annual bluegrass. In fact, bluegrass is highly tolerant to quinclorac. QuinKill Max can be used for some broadleaf species, including clovers, dollarweed, and speedwell. For better control of broadleaf weeds, you will probably want to tank mix with another product with 2,4-D or Trimec, such as Fertilome Weed-Out Lawn Weed Killer with Trimec. Be sure to check the product label to be sure it is safe to use on your turf. If you would like more assistance selecting a product for your needs, please feel free to call our Customer Service team at 866-581-7378 M-F 9a-5p EST.
According to the QuinKill Max Crabgrass and Weed Killer product label, this product can safely be applied to common Bermudagrass, annual Bluegrass, Kentucky Bluegrass, Buffalograss, Tall Fescue, annual Ryegrass, perennial Ryegrass and Zoysiagrass. It should NOT be applied to Fine Fescue (unless part of a seed blend), Bahiagrass, Carpetgrass, St. Augustinegrass, Centipedegrass, Dichondra, or lawns or turf where desirable clovers are present.
QuinKill Max Crabgrass and Weed Killer can be reapplied 2-3 weeks after first treatment. It is normal not to see a burn down just yet. This can tak at least 2 weeks to occur.