APSnet Image of the Week - Rust-infected guava fruits showing powdery masses of orange-yellow urediniospores

APSnet Image of the Week

Rust-infected guava fruits showing powdery masses of orange-yellow urediniospores.

Contributed by Marli F. S. Papa
São Paulo State University
Av. Brasil, 56 - 15385-000 - Ilha Solteira, SP, Brazil
marlifsp@bio.feis.unesp.br

Host: Psidium guajava (Guava)
Disease name: Guava rust
Pathogen name: Puccinia psidii

Guava (Psidium guajava - Myrtaceae) rust is the most important disease of guava trees in Brazil. Young leaves, flower buds, flowers, young fruit and green shoots are infected by Puccina psidii. The autoecious rust pathogen attacks and produces symptoms and signs on guava, jamb (Eugenia jambos), jaboticaba (Myrciaria jaboticaba) and Eucalyptus spp. Control of guava rust can be obtained with fungicides and cultural methods. This rust disease is a serious potential threat to natural forests and plantations of Eucalyptus spp. in both Southern Africa and Australia.

APS publication number: IW000023

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