Problem: Coarse Fescue
Festuca arundinacea This cool-season, perennial, bunch-type grass is very durable. It is commonly used on athletic fields because it holds up well under hard wear. Tall fescue makes an attractive turf when grown by itself. When it is seeded with, or invades, bluegrass, bermudagrass, or ryegrass lawns, however, it is considered a weed. It becomes very clumpy and makes an uneven turf. When insects and diseases attack the desirable grasses in the lawn, the tall fescue is usually not affected. It resists diseases and grubs, and sod webworms attack it only if they''ve eaten everything else. It is also somewhat heat tolerant, and its deep roots help it survive periods of heavy moisture and drought.
Omit a regular mowing before treating to allow for enough leaf tissue to absorb the chemical. One week after spraying, mow the fescue and reseed the area.