People typically notice rust on cool-season turf species, such as fescues and ryegrass. But it also can attack warm-season species such as burmudagrass. Symptoms of rust appear as irregular areas or distinct patches of turf having a yellowing or orange color. Leaves will have tiny pustules or blisters on their surface that when ruptured release a powdery mass of spores.
An easy way to notice these is to wipe a white cloth across the lawn. The tiny spores will easily show up as an orange stain.
Turf stresses such as drought and nitrogen deficiency are associated with this disease, so good turf management will help control rust. Apply fungicides that are effective in managing rust.
For more information on this turf disease please follow this link to University of Arkansas Turf Website.
http://turf.uark.edu/publications/factsheets/Rust%20of%20Arkansas%20Turfgrasses%20FSA7559%20web.pdf