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Fungi

Eucalyptus rust
Puccinia psidii G. Winter Urediniomycetes, Uredinales

Status
Exotic (absent from Australia) High Impact Pest Species

Other hosts

Caption: Symptoms on leaf of Malaysian apple

Source: Dr Silvaldo F. Silveira UENF

Symptoms:

The fungus attacks young tissues of new leaves, fruits, flowers, shoots and succulent twigs. The first symptoms are chlorotic specks which become, after a few days, pustules containing uredia producing yellow masses of spores. Pustules can coalesce and parts of the plant can be completely covered with pustules. After about 2-3 weeks, pustules dry and become necrotic. The disease can cause deformation of leaves, heavy defoliation of branches, dieback, stunted growth and even death. On fruits of guava (Psidium guava, Psidium spp.), Ruberry (Myrcia spp., Myrciaria spp.) and other native American hosts in the Myrtaceae, the lesions occur mostly on buds and young fruits that eventually rot as the rust matures.

The fungus:

This autoecious fungus has a macrocyclic life cycle, producing aecia, uredinia, telia and basidia. Uredia amphigenous, in groups on brownish or blackish spots up to 5 mm. In diam., pale yellowish, 0.1―0.5 mm diam. Urediniospores ellipsoidal to obvoidal, 10―26 x 15―25 μm, wall hyaline, finely echinulate, 1.5―2.5 μm thick, no pores seen. Teliospores appearing in the uredia or in telia, club-shaped, ellipsoidal to cylindrical, rounded above, with a papilla, bicellular, slightly constricted at septum, 30―60 x 15―28 μm, wall buff, smooth, 1―1.5 μm thick at the side, 2―4 μm thick above, pedicels fragile, often deciduous. Both cells of the teliospore can germinate to form basidia. Basidiospores are borne on sterigmata. Aeciospores are similar to the urediniospores. (Laundon & Waterston 1965). Telia are usually produced under hot weather on mature plant tissue (Ferreira 1989).

Corresponding author: Dr Jose R. Liberato

Citation: Liberato JR, Silveira SF, Junghans DT, Rocabado, JA, Aparecido CC & Shivas RG (2009) Eucalyptus rust (Puccinia psidii ) Pest and Diseases Image Library. Updated on 10/19/2009 4:56:03 PM. Available online: http://www.padil.gov.au

Created Date: 3/7/2006 2:31:06 PM

Last Updated: 10/19/2009 4:56:03 PM

Overview Images
Host Symptoms	Host Symptoms	Host Symptoms	Host Symptoms
Host Symptoms	Host Symptoms	Host Symptoms	Host Symptoms
Host Symptoms	Host Symptoms	Host Symptoms	Host Symptoms
Host Symptoms	Host Symptoms	Host Symptoms	Spores-LM
Spores-LM	Spores-LM	Spores-LM	Spores-LM
Spores-LM	Spores-LM	Other hosts	Other hosts
Other hosts	Other hosts	Other hosts	Other hosts
Other hosts	Other hosts	Other hosts	Other hosts
Other hosts	Other hosts	Other hosts	Other hosts
Spores-SEM	Spores-SEM