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Rust

Rust
Crown - Puccinia coronata; Leaf - Uromyces dactylidis; Stem (Black) - Puccinia graminis; Stripe (Yellow) - Puccinnia striiformis.

Turf Disease

Rusts: Causal Agent: Crown - Puccinia coronata; Leaf - Uromyces dactylidis; Stem (Black) - Puccinia graminis; Stripe (Yellow) - Puccinnia striiformis. 

South Africa Golf Turf Care Treating Rust
Susceptible turfgrass
Kentucky bluegrass, annual bluegrass, ryegrass, old bentgrass cultivars, Bermuda grass, and tall and fine fescue.

Symptoms

  • Rust diseases cause light yellow flecks initially on the leaf blades and sheaths. The flecks enlarge, elongate and turn yellow in colour.

  • The infected areas rise above the epidermis and then rupture, releasing spores that are yellowish-orange to reddish-brown in colour.

  • The leaf blade turns yellow starting at the tip and progressing to the base sheath.

  • A severe disease infection can cause the shoot to turn yellowish to reddish-brown in colour and slow in growth.

  • The turf may appear thin as individual shoots die.

Conditions favouring disease

  • Rust diseases typically occur in early spring through autumn, depending on the location of the turf.

  • Rusts favour moist, low-light areas.

  • Depending on the species, rusts favour temperatures between 18°C and 30°C.

  • Severe rust infections occur on slow-growing turfgrass, particularly those with low nitrogen levels and/or plant water stress.

Integrated turf management

  • Convert to a turfgrass species or cultivar (especially for Kentucky bluegrass and perennial ryegrass) that are resistant to rust diseases found in the area.

  • Apply adequate levels of nitrogen.

  • Remove clippings from turf.

  • Reduce thatch.

  • Reduce shade and improve air circulation.

  • Regulate irrigation to minimise the amount of time moisture remains on the leaf surface.

  • Water deeply and infrequently.

  • Use penetrant fungicides to control rust diseases on slow-growing grasses and to grasses that are not mown.

Fungicidal Control
Banner  and Heritage have a label recommendation for rust in South Africa.