Abstract

SANDOVAL-SANCHEZ, Maricarmen; NAVA-DIAZ, Cristian; PEREZ-CARCAMO, Jorge  and  SANDOVAL-ISLAS, José Sergio. Identification of daylily rust (Puccinia hemerocallidis) and characterization of resistance of five genotypes. Rev. mex. fitopatol [online]. 2020, vol.38, n.1, pp.25-39.  Epub Nov 27, 2020. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.1910-3.

Daylily (Hemerocallis spp.) is attacked by the fungus Puccinia hemerocallidis. In Mexico there are no reports of this disease nor of plant material resistant to the pathogen. Since 2008, symptoms of rust on leaves of H. lilioasphodelus have been observed in the garden of a private house in the municipality of Chicoloapan de Juárez, State of Mexico, and in a nursery in Fortín de las Flores, Veracruz. The objectives of this investigation were to identify morphologically and molecularly the isolates of both locations and characterize the resistance to this disease macroscopically in five genotypes of Hemerocallis spp. under greenhouse conditions. According to the morphological characteristics of uredospores, teliospores and molecular studies, the fungus was identified as P. hemerocallidis. The genotypes evaluated were grouped into three resistance categories: H. lilioasphodelus behaved susceptible; ‘Radiant Greetings’ and ‘Stella d’Oro’ cultivars of the H. hybrida species were classified as moderately resistant; the cultivar ‘Cherry Wine’ and the species H. fulva were grouped as resistant; the latter presents a probable partial resistance sensu Parlevliet. The presence of P. hemerocallidis and the resistance of daylily genotypes are reported for the first time in Mexico.

Keywords : cultivars; Hemerocallis lilioasphodelus; Hemerocallis fulva; hypersensitivity resistance; partial resistance..

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