Daylily Rust: Identification and Persistent Fungicide Program

Orange powder on white tissue rubbed under daylily leaves confirms daylily rust (a fungus requiring high humidity).

Control Protocol

1. Remove and destroy all infected leaves.
2. Spray contact fungicide (chlorothalonil/Daconil) to kill surface spores.
3. Alternate weekly with systemic fungicide (myclobutanil/Immunox) to protect tissue.
4. Persist—control requires consistency.

Consult "A Daylily Rust FAQ" for resistant cultivars.