Fungal causal agent: Puccinia hemerocallidis

Symptoms:  Symptoms begin as yellowish/whitish spots on the upper surface of the leaves 7 to 10 days after infection.   As these spots develop, they erupt into masses of bright yellow/orange spores breaking through the epidermis.These spores are called urediniospores and are round to slightly elongate and golden-brown.  

Management:. The most  effective management to reduce losses to rust is to use resistant cultivars. Restricted use fungicides are available for commercial growers that can be applied on 7-, 14-, 21- or 28- day schedules. Fungicides for home use can also be effective at limiting rust on daylily when applied before disease is established (preventatively).  Please visit  the following link for more information: http://www.freshfromflorida.com/Divisions-Offices/Plant-Industry/Plant-Industry-Publications/Pest-Alerts/Pest-Alerts-Daylily-Rust. In addition apply fungicides early to reduce inoculum. Check http://premier.cdms.net/webapls/formsloginRef.asp?/webapls for current labels.