Dollar Spot on New Sod: Fungicide, Fertilizer & Water Timing

New sod in California developed dollar spot after twice-daily watering (including late night) due to restrictions. A fungicide was applied, then quick-release nitrogen was recommended. What now?

Fungicide Role & Limits

Fungicides halt spread but don't cure existing lesions. If favorable conditions (warm, humid nights) return after the chemical degrades, the fungus reactivates.

Critical Cultural Fix: Dry Before Dark

• Shift irrigation to early morning (4–6 AM) so blades dry by mid-morning.
• Never water after 4 PM.
• Mow at recommended height with sharp blades to reduce stress.

Nitrogen: Use Caution

Quick-release N can boost recovery but may flare the disease if humidity stays high. Apply at half-rate, only if soil test shows deficiency, and pair with morning-only watering.

Long-term: dollar spot thrives on wet nights and low nitrogen. Fix the water schedule first; fertilize based on soil test, not panic.