Photo 1. A branch affected by vascular streak dieback, Oncobasidium theobromae, where the leaves have mostly fallen.
Photo 2. Yellow leaves with green spots, and abnormal development of axillary buds, on a cocoa branch affected by vascular streak dieback, Oncobasidium theobromae.
Photo 3. White sporulating growth of the vascular streak dieback fungus, Oncobasidium theobromae, on a cocoa branch.
Cocoa vascular streak dieback
AUTHOR Grahame Jackson
Information (and Photo 1) from CABI (2012) Oncobasidium theobramae Crop Protection Compendium. (https://www.cabi.org.cpc/). Photos 2&3 Chris Prior, Royal Horticultural Society, Wisley Laboratory, UK. Photo 4 Richard Markham, ACIAR, Canberra.
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.
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