Yellow Patches on New Creeping Fescue Green: Diagnosis Guide

New creeping fescue green (3 months old). Yellow patches, not water-related. Fertilized 3-2-3 and 4-1-1—no improvement. Frustrated.

Creeping Red Fescue Basics

• pH 5.5–8.0, well-drained soil.
• N: 1–2 lb/1000 sq ft during active growth (Mar–Jun, Oct–Dec).
• Water: 1–2×/wk summer; dormant if dry.
• Full sun = more water needed.
• Shade = trees steal water; monitor.

Diagnose the Yellowing

1. Pattern: Circular? = fungus. Straight edges? = abiotic (buried debris, spill).
2. Tug test: Slimy/easy pull = fungus. Firm = root issue.
3. Soap flush: 2 oz dish soap in 2 gal water over 2 ft². Bugs surface in minutes.
4. Soil test: Compare good vs. bad areas (pH, nutrients, salts).

Common Causes on New Greens

Cause	Signs	Fix
Dollar spot	Silver-dollar spots, cobweb mycelium AM	Fungicide (propiconazole), adequate N
Red thread	Pink threads, red tips	Fungicide, 0.5 lb N quick-release
Nutrient deficiency	Uniform yellow, no patches	Soil test, targeted fert
Buried debris	Straight edges, same spots yearly	Excavate, replace soil
Water repellency	Dry patches despite irrigation	Wetting agent, aeration

Immediate Actions

• Stop guessing—diagnose (pattern, tug, soap flush, soil test).
• Apply complete fertilizer at establishment rate if not done.
• Protect from traffic until mature (1 year).

New greens are sensitive. Diagnose before spending more on fertilizer.