Orange Powder on Zoysiagrass? It's Likely Rust Disease

An orange, powdery coating on zoysiagrass blades is a classic sign of rust disease. While more common in cool, moist conditions of late fall, it can appear anytime—especially in shady areas.

To manage it: mow every 4–5 days and bag the clippings to remove spores. Fungicides containing mancozeb, myclobutanil (Immunox), or triadimefon (Bayleton) are effective when applied according to label directions. Always read and follow the product label for rates and timing.