Rust seems to be associated with Zoysia turf more than the other lawn grasses, but can also be present in Fescue turf. In the fall, Zoysia turf is in “transition” and more susceptible to rust. It’s seen in moist, low-light areas. Rust favors temperatures between 65°F and 85°F. Severe rust infections occur on slow-growing turfgrass, particularly those with low nitrogen levels and/or plant water stress. Rust infected plants are weakened. When the disease continues into late fall, infected plants may become more susceptible to winter injury. Fungicides will aid in the control of rust, but multiple applications are generally required.