First Report of Pink Disease on Native Trees in South Africa and Phylogenetic Placement of Erythricium salmonicolor in the Homobasidiomycetes

Plant Disease
Jolanda Roux, M P A Coetzee

Abstract

Erythricium salmonicolor causes a canker and die-back disease, commonly known as pink disease, on many tree species. During an investigation of diseases of Podocarpus henkellii and P. latifolius in the Mpumalanga Province of South Africa, typical symptoms of pink disease were observed on the branches of these trees. Stem and branch cankers covered with cracked bark and abundant pink mycelial growth were common on the affected trees. In subsequent surveys, the disease was also found on native Dais cotonifolia in the same area, as well as on native Ekebergia capensis and Maesa lanceolata in the KwaZulu-Natal Midlands. Phylogenetic analyses of ribosomal large subunit DNA sequence data were used to confirm the identity of the pathogen and obtain an indication of its phylogenetic placement within the Homobasidiomycetes. Isolates from all the native hosts recorded in this study, as well as from exotic Eucalyptus sp. and Acacia mearnsii, formed a strongly supported clade together with isolates from other parts of the world. Results confirmed that the pathogen in South Africa is Erythricium salmonicolor. Isolates from South Africa and Ethiopia grouped closely together, slightly different from E. salmonicolor isolates from the rest of t...Continue Reading

References

Dec 26, 2001·Bioinformatics·S KumarM Nei
Feb 14, 2002·Molecular Phylogenetics and Evolution·Manfred Binder, David S Hibbett
Oct 28, 2004·Mycological Research·Karl-Henrik LarssonUrmas Kõljalg
Jul 1, 1985·Evolution; International Journal of Organic Evolution·Joseph Felsenstein

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