Discovery of the Canker Pathogen Chrysoporthe austroafricana on Native Syzygium spp. in South Africa

Plant Disease
R N HeathMichael J Wingfield

Abstract

Chrysoporthe canker is one of the most important diseases of plantation-grown Eucalyptus spp. in tropical and subtropical regions worldwide. For many years, the disease was reported to be caused by the fungal pathogen Cryphonectria cubensis. Recent DNA-based studies have shown that the fungus in South Africa is not conspecific with Chr. cubensis and it was recently described in the new genus Chrysoporthe as Chrysoporthe austroafricana. Chr. austroafricana is known only from South Africa, where it causes severe cankers on Eucalyptus spp. and on ornamental Tibouchina trees, both of which have been introduced into South Africa. The origin of Chr. austroafricana is unknown, but it is possible that it expanded its host range from native trees related to Eucalyptus and Tibouchina spp. to these exotic hosts. Subsequent surveys of some indigenous South African Myrtales led to the discovery of fruiting structures resembling those of Chr. austroafricana on native Syzygium cordatum and S. guineense. The fungus from these Syzygium spp. was identified as Chr. austroafricana based on morphological characteristics and β-tubulin gene sequences. Pathogenicity trials showed that Chr. austroafricana is more virulent on exotic Eucalyptus spp. than...Continue Reading

Citations

Jun 19, 2010·Antonie van Leeuwenhoek·Aime Didier B BegoudeJolanda Roux
Feb 20, 2019·Plant Disease·Saleh PanahandehDavid Gramaje
Apr 28, 2006·FEMS Microbiology Letters·Marieka GryzenhoutMichael J Wingfield
Apr 30, 2021·Fungal Biology·Carolina CornejoDaniel Rigling
Apr 28, 2021·Plant Disease·Amelia C Montoya-MartínezGerardo Rodríguez-Alvarado
May 21, 2008·Studies in Mycology·Grace NakabongeMichael J Wingfield
Mar 10, 2016·Studies in Mycology·D A HerronE T Steenkamp

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