Plant Disease (2006) 90, 734-740

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G. Nakabonge, J. Roux, M. Gryzenhout and M.J. Wingfield (2006)
Distribution of chrysoporthe canker pathogens on Eucalyptus and Syzygium spp. in eastern and southern Africa
Plant Disease 90 (6), 734-740
Abstract: Chrysoporthe cubensis and C. austroafricana, collectively known as Cryphonectria cubensis in the past, are important canker pathogens of Eucalyptus spp. worldwide. Previous studies have suggested that Chrysoporthe austroafricana occurs only in South Africa, whereas C. cubensis occurs in Australia, Cameroon, Tanzania, Democratic Republic of Congo, Republic of Congo, Southeast Asia, and South, Central, and North America. In South Africa, C. austroafricana is a pathogen on nonnative Eucalyptus (Myrtaceae) and Tibouchina (Melastomataceae) spp., both residing in the order Myrtales. Recently, the fungus also has been found on native Syzygium cordatum trees in the country, leading to the hypothesis that it is native to Africa. In contrast, C. cubensis is thought to have been introduced into Africa and is known only on non-native Eucalyptus spp. and S. aromaticum (clove) in four countries. The aim of this study was to consider the distribution of Chrysoporthe spp. on non-native Eucalyptus spp. as well as on native Myrtales in southern and eastern Africa. Isolates were collected from as many trees as possible and characterized based on their morphology and DNA sequence data for two gene regions. Results show, for the first time, that C. cubensis occurs in Kenya, Malawi, and Mozambique on non-native Eucalyptus spp. C. austroafricana was found for the first time in Mozambique, Malawi, and Zambia on non-native Eucalyptus spp. and native S. cordatum. The known distribution range of C. austroafricana within South Africa also was extended during these surveys.
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Full text of article
Database assignments for author(s): Michael J. Wingfield, Jolanda Roux, Marieka Gryzenhout

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Chrysoporthe cubensis Eucalypt (Eucalyptus) Kenya
Chrysoporthe cubensis Eucalypt (Eucalyptus) Malawi
Chrysoporthe cubensis Eucalypt (Eucalyptus) Mozambique
Chrysoporthe austroafricana South Africa
Chrysoporthe austroafricana Eucalypt (Eucalyptus) Malawi
Chrysoporthe austroafricana Eucalypt (Eucalyptus) Mozambique
Chrysoporthe austroafricana Eucalypt (Eucalyptus) Zambia
Chrysoporthe austroafricana Eugenia/Syzygium (genera)