Resistance Reaction of Daylily Cultivars to Puccinia Hemerocallidis

Authors: LI, Y - UNIV OF TENN; WINDHAM, M - UNIV OF TENN; TRIGIANO, R - UNIV OF TENN; Fare, Donna; Spiers, James; Copes, Warren

Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2005
Publication Date: 6/1/2005
Citation: Li, Y.H., Windham, M.T., Trigiano, R.N., Fare, D.C., Spiers, J.M., Copes, W.E. 2005. Reactions of Daylily Cultivar Varying in Disease Resistance to Puccinia Hemerocallidis. American Phytopathological Society Annual Meeting. 95:S61.

Interpretive Summary:

Technical Abstract: Reactions of eight daylily cultivars to Puccinia hemerocallidis were investigated ten days after inoculating detached leaf segments. Leaves of highly resistant cultivars, ‘Prairie Blue Eyes’ and ‘Bertie Ferris’, were characterized as having tiny yellow spots or no symptoms at the point of penetration by the fungus . Resistant leaves of cultivars, ‘Buttered Popcorn’, ‘Chicago Apache’ and ‘Stella De Oro’, showed hypersensitive reactions and uredia were not formated. Detached leaves of moderately susceptible cultivars, ‘Mary Todd’ and ‘Chorus Line’, exhibited hypersensitive reactions, but uredia formed and the fungus sporulated, whereas leaves of susceptible cultivars, ‘Pardon Me’, supported abundant spore production without a hypersensitive reaction. Rust development on abaxial and adaxial leaf surfaces of ‘Pardon Me’ were compared in combinations of the side of the leaf inoculated and the orientation of the leaf during incubation. There were significantly lower values of infection efficiencies and delayed latent period on adaxial leaf surface compared to abaxial surface regardless incubation sides