Lawn Rust Disease: Why Your Grass Turns Orange-Yellow in Late Summer

Identification

Yellow-orange powder on blades, shoes, mower = rust fungus. Common on Kentucky bluegrass, ryegrass, fescue in late summer/fall.

Causes & Cultural Cure

• Low nitrogen → slow growth → rust develops.
• Water early morning; apply early fall nitrogen.
• Winter fertilizer around Thanksgiving.
• Prune for airflow/light; manage thatch.

Fungicides rarely work on home lawns. Improved fall growth usually outpaces rust.