Yellow Spring Lawn in Central PA: Diagnosing the Cause

Every spring your lawn starts yellow (like straw) while neighbors’ are green. It greens up by May, feels soft, but yellows first in drought. Suspect different grass type.

Three Cause Categories

1. Pests: Soap flush (2 oz dish soap/2 gal water) to reveal insects. ID harmful ones; treat if thresholds exceeded.
2. Diseases: ID your grass species, then match symptoms to known diseases (e.g., yellow patch, summer patch). Extension Office can help.
3. Cultural/Environmental: Irrigation, fertilization, herbicide history (especially weed-and-feed), nutrient deficiencies (iron chlorosis common in high-pH soils), spills (chlorinated pool water).

Diagnostic Steps

• Soil test (pH, nutrients).
• Check for iron deficiency: interveinal yellowing on young leaves.
• Review past herbicide applications—some weed-and-feeds stunt certain grasses.

Before Resodding

Find and fix the cause first. Resodding without correction repeats the failure.