Pathogenicity of fungi isolated from atypical skin blemishes on potatoes in South Africa and Zimbabwe

dc.contributor.authorZimudzi, Josephine
dc.contributor.authorCoutinho, Teresa A.
dc.contributor.authorVan der Waals, Jacqueline Elise
dc.contributor.emailjacquie.vanderwaals@up.ac.zaen_ZA
dc.date.accessioned2017-08-21T08:23:48Z
dc.date.issued2017-06
dc.description.abstractPotato skin blemishes with known causes (typical blemishes) are manageable in contrast to those with unknown causes (atypical blemishes). This study investigated possible fungal causal agents of atypical tuber blemishes in South Africa and Zimbabwe through isolation and pathogenicity testing. Several fungal genera were isolated from elephant hide, corky cracks, star-shaped lesions, circular corky lesions, raised corky spots, enlarged lenticels and russetting. Koch’s postulates could not be fulfilled with most of the isolates except for binucleate Rhizoctonia (BNR) AG A, Macrophomina phaseolina and Rhizoctonia solani AG 3-PT. BNR AG A isolates from South African tubers of cv. Up-to-Date reproduced circular and linear defects on tubers. M. phaseolina isolates inoculated on South African cv. Mondial reproduced dark, circular lesions around lenticels conforming to typical symptoms of charcoal rot on potato tubers. R. solani AG 3-PT isolates reproduced corky cracks with elephant hide and black scurf with similar aggressiveness on cvs Mondial (South Africa) and Diamond (Zimbabwe). This is the first report of charcoal rot caused by M. phaseolina and of tuber defects caused by BNR AG A on potato in South Africa. This is also the first report of tuber cracking and elephant hide caused by R. solani AG 3-PT on potato in Zimbabwe. The findings from this work are crucial in formulating control strategies against these pathogens in order to improve potato tuber quality on the market.en_ZA
dc.description.departmentForestry and Agricultural Biotechnology Institute (FABI)en_ZA
dc.description.departmentMicrobiology and Plant Pathologyen_ZA
dc.description.departmentPlant Production and Soil Scienceen_ZA
dc.description.embargo2018-06-29
dc.description.librarianhj2017en_ZA
dc.description.sponsorshipThe National Research Foundation (NRF)en_ZA
dc.description.urihttp://link.springer.com/journal/11540en_ZA
dc.identifier.citationZimudzi, J., Coutinho, T.A. & Van der Waals, J.E. Pathogenicity of fungi isolated from atypical skin blemishes on potatoes in South Africa and Zimbabwe. Potato Research (2017) 60: 119-144. https://doi.org/10.1007/s11540-017-9345-0.en_ZA
dc.identifier.issn0014-3065 (print)
dc.identifier.issn1871-4528 (online)
dc.identifier.other10.1007/s11540-017-9345-0
dc.identifier.urihttp://hdl.handle.net/2263/61745
dc.language.isoenen_ZA
dc.publisherSpringeren_ZA
dc.rights© European Association for Potato Research 2017. The original publication is available at : http://link.springer.comjournal/11540.en_ZA
dc.subjectRhizoctonia solani AG 3-PTen_ZA
dc.subjectPotatoen_ZA
dc.subjectMacrophomina phaseolinaen_ZA
dc.subjectAtypical blemishesen_ZA
dc.subjectBinucleate Rhizoctonia AG Aen_ZA
dc.titlePathogenicity of fungi isolated from atypical skin blemishes on potatoes in South Africa and Zimbabween_ZA
dc.typePostprint Articleen_ZA

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