Daylily Rust:
What We Know Now

Leaf Rust on Daylily

Daylily Rust Distribution Map

Rust Spread

Insect Spread?

Hemerocallis fulva is Susceptible

Factors Affecting Rust Development and Latency

Slide 8

Fungus grows intercellularly from infection point; new pustules can break through leaf epidermis.

Leaf Rusts are Polycyclic Diseases

Anatomy of a Disease Epidemic

Chemical Control Considerations

Example of Increasing Lag Phase of Epidemic Using Fungicides

Daylily rust symptoms

Susceptibility of 25 Cultivars

Cultivar Susceptibility

Uredinial/Telial Host: Daylily (Hemerocallidaceae) 
        and Hosta (Liliaceae)????
Aecial Host: Patrinia spp. (Valerianaceae)

Theorized Rust Life Cycle

Other Hosts for Daylily Rust?

Rust Survival

Daylily Rust Status in the United States

What’s the Goal?

What’s the Goal?   Option B

Control Suggestions