Answer: Quack grass is commonly called swamp grass so that may very well be what you have growing in your Zoysia turf. Regularly mowing your lawn at the proper height (1/2 - 1") will go a long way in controlling quack grass.
Quack grass comes back year after year just like your lawn. They spread through seeds and extensive underground root systems and are unaffected by broadleaf killers. Pulling grassy weeds only gets some of the roots, and the remaining ones will quickly sprout new plants. The only effective solution is to use a ?nonselective? plant killer like Super Kills-All or Roundup. You can apply non-selective killers with sprayers, but you?ll kill everything in the area, including your lawn and any other nearby plants. The best way to kill these weeds while protecting surrounding plants is by wiping the grass blades with the non-selective herbicide. Wear a cheap cloth glove over a plastic or rubber chemically resistant (they?re labeled as such) glove to protect your skin. Dip your gloved hand into the herbicide and then simply grab the blades near the base and pull the herbicide over the grass blades. Don?t worry about coating every single blade. The chemical will absorb into the plant, make its way down to the roots and kill the entire plant. Most will die in a few days, but survivors may need more treatments.
Best wishes with your lawn!
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