Identifying Yellowish White Foam on Lawn: Possible Fungal Issue

Mystery Foam

Yellowish-white foam on grass blades is rare. Likely a fungus (slime mold or unusual fungal growth) favored by dampness, shade, or decaying organic matter (dead root, buried wood).

Immediate Steps

1. Consult a local nurseryman with a sample/photo.
2. If unidentified, treat as fungus: drench area with baking soda solution (1/4 cup per gallon water).
3. Or apply corn gluten meal around affected area (pre-emergent + mild fungistat).

Cultural Improvement

• Improve drainage and air circulation.
• Reduce irrigation frequency.
• Top-dress with compost to boost beneficial microbes.

Most lawn fungi are cosmetic and self-limiting if soil health improves.