Scientific Name: Puccinia striiformis
Turfgrass host: Tall Fescue, Kentucky Bluegrass, Perennial Ryegrass
Time of Year: May thru October
How To Identify Rust
All types of turgrass are susceptible to one or more species of rust fungi, but in Michigan it is primarily a problem of Kentucky Bluegrass and Perennial Ryegrass. Rust occurs when it is hot and dry and the grass stops growing. Heavily infected turf becomes reddish brown to yellow-orange because of the large number of fungi pusules growing on grass blades. The rust material easily rubs off onto fingers, shoes, and clothing. A severe rust infection results in thin, weakened turf that is more susceptible to winterkill, drought, and other disease.
How to get rid of Rust
Fertilize, water, and mow high. DMI fungicides will help cure Rust disease, but it is important to keep a dense vigorous growing turf.