Plant Pathology (2015) 64, 1326-1335

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J. Roux, I. Germishuizen, R. Nadel, D.J. Lee, M.J. Wingfield and G.S. Pegg (2015)
Risk assessment for Puccinia psidii becoming established in South Africa
Plant Pathology 64 (6), 1326-1335
Abstract: Puccinia psidii, the causal agent of myrtle rust, was first recorded from Latin America more than 100 years ago. It occurs on many native species of Myrtaceae in Latin America and also infects non-native plantation-grown Eucalyptus species in the region. The pathogen has gradually spread to new areas including Australia and most recently South Africa. The aim of this study was to consider the susceptibility of selected Eucalyptus genotypes, particularly those of interest to South African forestry, to infection by P. psidii. In addition, risk maps were compiled based on suitable climatic conditions and the occurrence of potential susceptible tree species. This made it possible to identify the season when P. psidii would be most likely to infect and to define the geographic areas where the rust disease would be most likely to establish in South Africa. As expected, variation in susceptibility was observed between eucalypt genotypes tested. Importantly, species commonly planted in South Africa show good potential for yielding disease-tolerant material for future planting. Myrtle rust is predicted to be more common in spring and summer. Coastal areas, as well as areas in South Africa with subtropical climates, are more conducive to outbreaks of the pathogen.
(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): Jolanda Roux, Ryan L. Nadel, Michael J. Wingfield, Geoffrey S. Pegg

Research topic(s) for pests/diseases/weeds:
quarantine treatments/regulations/aspects

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Austropuccinia psidii Eucalypt (Eucalyptus)