The lighter grass is likely common Bermuda invading the darker hybrid sod. Eradication is difficult; "Roundup and resod" is the most reliable fix. Identifying Bermuda varieties is tricky.

Reviving Thin Bermudagrass in Shade and Wet Soil in Georgia
Bermuda and Zoysia Together: Similar Summer Look, Different Spring/Fall
Bermuda in Centipede: Dig Out or Spot-Spray Sethoxydim
Removing Bermudagrass from Fescue Lawns: Fluazifop and Glyphosate Strategies
Overseeding Bermudagrass with Ryegrass for Winter Color
Weed Control in Bermuda/Tiffway With 150 Trees: Trimec With Extreme Caution
Identifying and Eliminating Ant Infestations in New Jersey
What Your Weeds Are Telling You About Your Soil
Last Fertilization Date for Bermuda Grass: Mid-September
Why Bermuda Grass Looks Patchy in Fall: The Frost Effect
Copyright © www.100flowers.win Botanic Garden All Rights Reserved