Austropuccinia psidii

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Austropuccinia psidii symptoms on guava leaf
Source: Florida Department of Agriculture and Consumer Services - IPM Images

Austropuccinia psidii (G. Winter) Beenken 2017 - (eucalyptus rust)

The fungus attacks various species of the family Myrtaceae. It causes important forestry diseases in South America (apparently its centre of origin) and is considered to be a serious threat to eucalypt plantations worldwide. It was first detected in eastern Australia in 2010 (see Pegg et al., 2014).

The impact of A. psidii on individual trees and shrubs range from minor leaf spots, foliage, stem and branch dieback to reduced reproduction. Tree death, as a result of repeated infection, has been recorded for some species. Losses of approximately 20% have been reported on eucalypt seedlings in South America.

Vernacular names
• English: eucalyptus rust
guava rust
myrtle rust
• Español: roya del guayabo
• Français: rouille du goyavier

The fungi can be also beneficial if it attacks weeds like the invasive Melaleuca quinquenervia, see the page "Austropuccinia psidii as weed pathogen".

Puccinia psidii