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(79) All-America Daylilies: Landscape Performance and Rust Observations

2005; American Society for Horticultural Science; Volume: 40; Issue: 4 Linguagem: Inglês

10.21273/hortsci.40.4.1040c

2327-9834

Allen D. Owings, G. E. Holcomb, Anthony L. Witcher, Allen Broyles, Edward Bush,

Plant Pathogens and Resistance

All-American daylily cultivars named from 1994–2004 were evaluated for landscape performance and daylily rust ( Pucciniahemerocallidis ) susceptibility during 2003 and 2004. Cultivars included `Black-Eyed Stella', `Bitsy, `Leebea Orange Crush', `Plum Perfect', `Judith', `Starstruck', `Frankly Scarlet', `Lullaby Baby', `Lady Lucille', and `Chorus Line'. Bareroot plants were planted in raised beds composed of an Olivier silt loam soil in full sun and received irrigation as needed to prevent stress. Visual quality ratings were made weekly from 19 Apr.–25 Oct. 2003 and 15 Mar.–20 Sept. 2004. Visual quality ratings included growth habit, based on compactness, foliage color, uniformity, and overall aesthetics, and flowering, based on longevity and visual appeal. Other flower observations were made in regard to time in bud and peak blooming periods over the same time frames. Flowering observations indicated that `Black Eyed Stella' and `Bitsy' were the only cultivars showing reliable repeat bloom potential. Among the other cultivars, `Judith' was the earliest to bud and bloom, but also had a blooming period of only 2–3 weeks compared to 4–5 weeks of bloom for other cultivars. Daylily rust ratings were taken in Sept. and Nov. 2003 and in Aug. and Nov. 2004. Rust was most severe on `Judith', `Leebea Orange Crush', `Starstruck', and `Lady Lucille'. `Judith' and `Leebea Orange Crush' showed rust symptoms earlier than other cultivars. `Plum Perfect', `Frankly Scarlet', `Bitsy', `Black Eyed Stella', and `Lullaby Baby' were least susceptible to daylily rust.