Epidemic spread of Puccinia hemerocallidis in Brazil

Australasian Plant Disease Notes, Jan 2012

Since the first report of daylily rust (Puccinia hemerocallidis) in Brazil in the state of São Paulo in 2001, it spread during that decade and is now found in a very broad area encompassing central, northeastern, southern and southeastern Brazil. It is now regarded as one of the major disease problem for this popular ornamental. Events in Brazil were equivalent to those of the epidemic spread of P. hemerocallidis in the US which occurred around the same period.

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Epidemic spread of Puccinia hemerocallidis in Brazil

E. M. Inokuti 0 D. J. Soares 0 R. W. Barreto 0 0 Present Address: D. J. Soares Embrapa Algodo, Cx.P: 174, Rua Osvaldo Cruz, 1143, Centenrio, Campina Grande, PB 58428-095, Brazil 1 ) Departamento de Fitopatologia, Universidade Federal de Viosa , Viosa, MG 36570-000, Brazil Since the first report of daylily rust (Puccinia hemerocallidis) in Brazil in the state of So Paulo in 2001, it spread during that decade and is now found in a very broad area encompassing central, northeastern, southern and southeastern Brazil. It is now regarded as one of the major disease problem for this popular ornamental. Events in Brazil were equivalent to those of the epidemic spread of P. hemerocallidis in the US which occurred around the same period. - The first record of P. hemerocallidis in Brazil was by Carvalho et al. (2001) from the state of So Paulo based on the observation of urediniospores. Later its telial stage was observed in the state of Bahia, confirming its occurrence in Brazil (Menezes et al. 2008). Independently, additional collections of the same rust were made in Viosa Jul 2007 (state of Minas Gerais), Nova Friburgo- Mar 2010 (state of Rio de Janeiro), Braslia- Aug 2007 (Distrito Federal) and Balnerio Cambori Oct 2011 (state of Santa Catarina). Representative specimens were deposited in the local herbarium (Herbarium VIC) under the following respective accession numbers: 31312, 31314, 31315, 31313 and 31765. Morphology was as follows: lesions initially punctiform becoming elongated 0.55.5 0.51.5 mm, surrounded by necrotic zones; uredinia subepidermal 100310 m wide; urediniospores, globose to ellipsoid, 1729 15.523 m, walls 13 m thick, pale yellow, echinulate; telia emerging from old uredinia, teliospores bicellular, ellipsoidal to clavate, pedicelate, 3348 10.520 m, apical wall 2 5.5 m, lateral wall 0.51.5 m, brown, smooth, pedicels 27.5 m wide (Fig. 1ae) Quarantine measures in the USA failed to control the introduction and spread of Puccinia hemerocallidis (Wise et al. 2004). It was first detected in the US in 2000 but in 2002 USDA PPQ lifted the federal quarantine on this pathogen, because it was already present in over 24 states. In Brazil it was never listed as a quarantine pest. It also spread fast in Brazil since being first recorded in 2001 and is now present in the Northeast, Center, Southeast and Fig. 1 a Rust symptoms on plants. b Close up of rust lesions on leaf. c Uredinia of Puccinia hemerocallidis. d Urediniospores of Puccinia hemerocallidis. e Teliospores of Puccinia hemerocallidis


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E. M. Inokuti, D. J. Soares, R. W. Barreto. Epidemic spread of Puccinia hemerocallidis in Brazil, Australasian Plant Disease Notes, 2012, 7-8, DOI: 10.1007/s13314-011-0033-7