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IPM Scouting in Herbaceous Perennials

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Daylily rust
IPM scouting in herbaceous perennials > daylily rust
Pathogen: Puccinia hemerocallidis.

Hosts: Alcea and Patrina (alternate host).

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.
Infected daylily foliage
Powdery yellow-orange pustules on the surface of infected daylily foliage.
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.
This information was developed from A Pocket Guide for IPM Scouting in Herbaceous Perennials by Jan Byrne and Raymond A. Cloyd. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2981).
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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Updated 9/28/07