Rust is a fungal disease caused by various species within the genus Puccinia. It appears on your lawn as an orange powdery substance on the blades and gives the lawn an overall yellow or brown appearance. Rust is more common in late summer and early fall when the weather is dry. Prevention of rust on lawns is accomplished with proper turf cultural practices.
Water the lawn in the morning. Most lawns require enough water to moisten the top 4 to 6 inches of soil, according to master gardeners at the University of New Hampshire Cooperative Extension. Watering early in the day gives the lawn the moisture it requires during the hot afternoons.
Fertilize the lawn in September with a light application of nitrogen.
Mow the lawn frequently at the height recommended for your type of grass. Bag the grass clippings.
Give the grass more air and light by removing any overhanging tree branches or shrub foliage.