• Rusts - Crown, Leaf, Stem, and Stripe


    Symptoms:

    • Light yellow flecks initially on the leaf blades and sheaths. 
    • Flecks enlarge, elongate, and turn yellow in color. 
    • Infected areas rise above the epidermis and then rupture, releasing spores that are yellowish-orange to reddish-orange in color. 
    • Leaf blades turn yellow, starting at the tip and progressing to the base sheath. 
    • Severe disease infection can cause the shoot to turn yellowish to reddish-brown in color and slow in growth. 
    • Turf may appear thin as individual shoots die. 

    Conditions Favoring Disease:

    • Typically occur in early spring through fall, depending on the location of the turf. 
    • Favors low-light areas.
    • Depending on the species, rusts favor temperatures between 65F and 86F. 
    • Severe rusts infections occur on slow-growing turfgrass, particularly those with low nitrogen levels and/or plant water stress.