Daylily Rust in Japan

Pictured below is Puccinia hemerocallidis on Hemerocallis fulva var. longituba growing in Japan. The leaves on the left show the early stage development of dark colored telia (masses of teliospores) around the more familiar orange uredia (masses of urediospores). Urediospores are able to re-infect daylilies directly, but teliospores cannot. Teliospores germinate to produce basidiospores which infect the alternate host, Patrinia, and then complete the next stage of the life cycle. These infections on Patrinia produce aeciospores which return the rust to daylilies.

Rust on Hemerocallis fulva var. longituba

The illustrations below show that on an infected deciduous daylily the new growth is free of rust after winter. Click thumbnails for larger pictures

Location of daylilies next to a paddy field in late winter

Dead leaves from last year showing black telia

Division showing no telia were present below soil level

New growth shows no rust

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Š2002-2022. Photographer Y. Ono, images used with permission.