Pathogenicity of Colletotrichum species to Protea cultivars

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Contents Vol 35(1)

doi:10.1071/AP05097

Pathogenicity of Colletotrichum species to Protea cultivars

C. M. Lubbe ^A ^C ^F, S. Denman ^B ^C, S. C. Lamprecht ^C ^D, P. W. Crous ^C ^E

^A ARC—Fynbos Unit, Private Bag X1, Elsenburg 7607, South Africa.
^B Forest Research, Alice Holt Lodge, Farnham, Surrey G4 10LH, United Kingdom.
^C Department of Plant Pathology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa.
^D ARC—PPRI, Private Bag X5017, Stellenbosch 7599, South Africa.
^E Centraalbureau voor Schimmelcultures (CBS), Uppsalalaan 8, 3584 CT Utrecht, The Netherlands.
^F Corresponding author. Email: lubbec@arc.agric.za





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Australasian Plant Pathology 35(1) 37–41 http://dx.doi.org/10.1071/AP05097
Submitted: 14 February 2005 Accepted: 7 September 2005 Published online: 23 January 2006

Abstract

Colletotrichum species cause a wide range of diseases on Proteaceae. Four Colletotrichum species, C. acutatum, C. acutatum f. sp. hakea, C. boninense and C. gloeosporioides, have been associated with diseased Proteaceae in South Africa. In this study, the pathogenicity of these taxa was evaluated on three Protea cultivars. The relative aggressiveness of the isolates and the effect that wounding had on the host response were compared. Results showed that C. boninense and C. acutatum f. sp. hakea did not cause lesions significantly different from those on the controls. Isolates of C. acutatum and C. gloeosporioides originating from Protea were the primary pathogens associated with Colletotrichum leaf necrosis. Furthermore, C. acutatum was the main cause of anthracnose and stem necrosis of the selected Protea cultivars tested.