Australasian Plant Pathology (2011) 40, 442-447

Rodrigo N. Graça, Cristina P. Aun, Lúcio M.S. Guimarães, Bruno V.A. Rodrigues, Edival A.V. Zauza and Acelino C. Alfenas (2011)
A new race of Puccinia psidii defeats rust resistance in eucalypt
Australasian Plant Pathology 40 (4), 442-447
Abstract: Rust caused by Puccinia psidii is one the most destructive diseases of Eucalyptus. Management of the disease is achieved through selection of resistant host genotypes. Recently, eucalypt plants from clone BA6021, resistant to P. psidii isolate race-1, were infected by rust in Brazil. Microsatellite profiles of infected plants confirmed that the host was indeed clone BA6021. In pathogenicity tests, the resistant clones BA6021 and G21 (which carry the resistance gene Ppr-1) were found susceptible to the newly discovered isolate EUBA-1, indicating a new biotype of the pathogen. These results show that the isolate EUBA-1 and other potentially unrecognized pathogen races should be given strong consideration for eucalypt breeding programs aimed rust resistance.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Acelino C. Alfenas

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Austropuccinia psidii	Eucalypt (Eucalyptus)