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Characterization of Colletotrichum species associated with diseases of Proteaceae

     ARC Fynbos Unit, P. Bag X1, Elsenburg 7607, South Africa, and Department of Plant Pathology, University of Stellenbosch, P. Bag X1, Matieland 7602, South Africa

Sandra Denman

     Forest Research Station, Alice Holt Lodge, Farnham, Surrey, G10 4LH, United Kingdom

Paul F. Cannon

     CABI Bioscience, Bakeham Lane, Egham, Surrey, TW20 9TY, United Kingdom

J.Z. (Ewald) Groenewald

     Centraalbureau voor Schimmelcultures (CBS), Uppsalalaan 8, CT Utrecht, The Netherlands

Sandra C. Lamprecht

     Department of Plant Pathology, University of Stellenbosch, P. Bag X1, Matieland 7602, South Africa

Pedro W. Crous ¹

     Centraalbureau voor Schimmelcultures (CBS), Uppsalalaan 8, CT Utrecht, The Netherlands

Colletotrichum spp. are known to occur on and cause diseases of Proteaceae, but their identities are confused and poorly understood. The aim of the present study thus was to identify accurately the Colletotrichum spp. associated with diseases of cultivated Proteaceae. Colletotrichum spp. associated with proteaceous hosts growing in various parts of the world were identified based on morphology, sequence data of the internal transcribed spacer region (ITS-1, ITS-2), the 5.8S gene, and partial sequences of the ß-tubulin gene. Four species of Colletotrichum were found to be associated with Proteaceae. Colletotrichum gloeosporioides, a cosmopolitan species known to occur on numerous hosts, was isolated from Protea cynaroides cultivated in South Africa and Zimbabwe, and from a Leucospermum sp. in Portugal. A recently described species, C. boninense was associated with Zimbabwean and Australian Proteaceae but also occurred on a Eucalyptus sp. in South Africa. This represents a major geographical and host extension for the species and a description of the African strains is provided. Colletotrichum crassipes was represented by a single isolate obtained from a Dryandra plant in Madeira. Colletotrichum acutatum was isolated from Protea and Leucadendron in South Africa as well as from other hosts occurring elsewhere. A pathologically distinct population of this species was found to occur on Hakea in South Africa. This population is described as C. acutatum f. sp. hakeae, and its relationship with other strains of C. acutatum is discussed. Contrary to earlier literature reports linking C. gloeosporioides to anthracnose of Proteaceae, the present study has shown that several distinct species of Colletotrichum are associated with different diseases of this crop, which has serious implications for quarantine and disease control practices.

Key words: ß-tubulin, Colletotrichum acutatum, C. acutatum f. sp. hakeae, C. boninense, C. crassipes, C. gloeosporioides, Glomerella acutata, G. cingulata, ITS, systematics

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