MSU Extension Integrated Pest Management

Rusts and smuts

Pathogen

Puccinia hemerocallidis.

Hosts

Alcea and Patrina (alternate host).

Powdery yellow-orange pustules on the surface of infected daylily foliage.

Symptoms

Raised, yellow-orange, powdery pustules on the surface of infected foliage. Significant foliar dieback occurs on especially susceptible cultivars.

Spread

Spores can be dispersed by wind or air movement. Movement of infected plant material is responsible for much of the long-distance dissemination. This pathogen is not known to survive winters in the northern United States.

Management

Do not move or transport infected plant material. Carefully inspect incoming plant material for signs of rust. Fungicide applications are needed for disease management, especially on susceptible cultivars. Contact your local Extension office for information on ratings of cultivar susceptibility and current fungicide control recommendations.

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