Grass that is dead underneath, forms balls on top, and pulls out in handfuls is likely annual bluegrass (Poa annua). It often contaminates seed mixes.
Selective control in cool-season lawns is very limited. Check your seed bag label for Poa annua content. Use these resources for identification and options:
If not annual bluegrass, identify via the VT guide and re-contact for specific advice.
Moss Control in Pennsylvania Lawns
Troubleshooting Grass Seed Failure in Tucson's Desert Climate
Year-Round St. Augustine Care in Southern California
Improving Hard, Uneven Malaysian Grass in Thailand for Barefoot Comfort
How Grass Thickness Affects Water Absorption and Conservation
Dollarweed and Nutsedge in New St. Augustine: Spot-Treat or Renovate
Tiny Flies on New Sod: Harmless Adults, Watch for Larvae
Mushroom Half-Circle Killing St. Augustine: Fairy Ring or Fungus?
Wedding Lawn Crisis: Hire a Pro Now
Big Tree Shade Killing Grass: Weed & Feed Won't Help
Weed Control and Dead Spots in Floratam St. Augustine
Why You Shouldn't Fertilize Your Lawn in Early Spring Freeze Conditions
Resodding St. Augustine in Tampa: Soil Test First, Then Organic Renovation
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