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Plant Diseases
Daylily rust - Puccinia hemerocallidis

Yellow orange pustules

Pathogen: Puccinia hemerocallidis
Hosts: Alcea, Patrina (alternate host)
Symptoms: Raised yellowish-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 of this pathogen. This pathogen is not known to survive the winter in the northern areas of the U.S.
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. 

Diagnostic Services
Diagnostic Services

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