Australasian Plant Pathology (2010) 39, 141-145

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Edival A.V. Zauza, Michelle M.F. Couto, Vanessa M. Lana, Luiz A. Maffia and Acelino C. Alfenas (2010)
Vertical spread of Puccinia psidii urediniospores and development of eucalyptus rust at different heights
Australasian Plant Pathology 39 (2), 141-145
Abstract: Rust, caused by Puccinia psidii, is an important disease in eucalyptus nurseries and plantations in Brazil. In the field, eucalyptus plants taller than 3-4 m are not infected by the pathogen. We hypothesised that microclimatic conditions above 3 m do not favour either pathogen establishment or disease development. Therefore, we evaluated the effect of the height gradient on rust incidence, related to leaf wetness duration and the number of airborne urediniospores. Young eucalyptus plants were maintained at heights from 0.5 to 4.0 m, and disease was assessed weekly at all heights in five plant sets. Rust incidence reduced as height increased. The values of area under rust progress and rust incidence were negatively correlated (P < 0.05) with height and positively correlated (P < 0.05) with the number of both hours with leaf wetness and airborne urediniospores. Thus establishment and progress of eucalyptus rust were affected by leaf wetness duration and concentration of airborne urediniospores, which decreased as the height increased.
(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, Luiz A. Maffia

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
transmission/dispersal of plant diseases

Pest and/or beneficial records:

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

Austropuccinia psidii Eucalypt (Eucalyptus)