A Cure for Lawn Rust Disease

Rust

• Rust typically infects slow-growing and shaded turf and newly laid sod, according to North Dakota State University. Humid nighttime temperatures between 70 and 75 degrees Fahrenheit and daytime temperatures of 85 to 95 favor the disease's germination and spread. Noticing weather conditions that promote rust disease will help you provide early treatment if your lawn gets infected.

Damage

• Close examination of rust-infected grass can reveal yellow-orange pustules growing on grass blades, according to Purdue University. Seen from a distance, you lawn may appear to be yellowish green. Also, gardeners may notice a orange-yellow dust filling the area as they mow the grass. If rust goes untreated, grass blades will wither and die, so employ cultural treatment options before resorting to expensive chemical treatment.

Cultural Treatment

• Because rust occurs on slow-growing grass, gardeners should encourage grass growth by fertilizing in the summer, advises Purdue University. Apply a half pound of slow-release nitrogen per 1,000 square feet of lawn. If your region experiences hot temperatures, water your lawn for two days before, the day of and after applying nitrogen. Apply water in the morning, as wet grass blades and cool nighttime temperatures will spread the disease.

Chemical Treatment

• Apply a chemical treatment as a last resort, according to Purdue University. Use a fungicide that contains strobilurin to treat rust. The grass should not be experiencing water stress when the fungicide is applied. Fungicide will cause more stress to grass if it is dried out. Also, the fungicide will be less effective on newly planted turf. Follow the directions on the fungicide and reapply according to the directions. For optimal results, combine cultural treatment practices with the fungicide.