Effects of wetness duration, inoculum concentration and temperature on the development of Alternaria blight on transplants of sweet potato

dc.contributor.authorKandolo, S.D.
dc.contributor.authorAveling, T.A.S. (Terry)
dc.contributor.authorVan der Waals, Jacqueline Elise
dc.contributor.authorTruter, Mariëtte
dc.contributor.authorLaurie, S.M.
dc.contributor.emailterry.aveling@up.ac.zaen_ZA
dc.date.accessioned2019-04-03T12:36:34Z
dc.date.issued2018-06
dc.descriptionISHS Acta Horticulturae 1204: VII International Symposium on Seed, Transplant and Stand Establishment of Horticultural Crops - SEST2016.
dc.description.abstractAlternaria blight (AB) of sweet potato caused by Alternaria bataticola, is a limiting factor for sweet potato industries in various countries. The disease has been recently reported in South Africa. A thorough literature search indicates that factors influencing the development of AB have not been studied adequately. In the current study wetness duration, inoculum concentration and temperature/wetness duration interaction were evaluated for their effects on the disease incidence and disease severity of AB of sweet potato. Cultivars 'W119', reported susceptible to AB, were inoculated with a spore suspension of A. bataticola (PPRI 11930) under glasshouse and plant growth chamber conditions. In the wetness duration experiment, at the constant temperature of 28°C, each increase of wetness duration significantly increased the mean disease incidence (MDI) and mean disease severity (MDS). Exposure for 48 h was the optimum condition of this experiment, as it resulted in the highest MDI and MDS. In the inoculum concentration experiment the MDI and MDS increased significantly as the inoculum concentration increased but there was no significant difference between 3×104 conidia mL-1 and the highest inoculum concentration of 5x104 conidia mL-1. In the interaction of temperature and wetness duration the optimal temperatures and wetness duration in this study were 20 and 25°C for 48 h, respectively. Exposure at 35°C irrespective of wetness duration period did not produce any AB symptoms as shown by the MDI and MDS.en_ZA
dc.description.departmentForestry and Agricultural Biotechnology Institute (FABI)en_ZA
dc.description.departmentPlant Production and Soil Scienceen_ZA
dc.description.embargo2019-06-01
dc.description.librarianhj2019en_ZA
dc.description.sponsorshipThe University of Pretoria and the National Research Foundation (NRF).en_ZA
dc.description.urihttp://www.actahort.orgen_ZA
dc.identifier.citationKandolo, S.D., Aveling, T.A.S., Van der Waals, J.E. et al. 2018, 'Effects of wetness duration, inoculum concentration and temperature on the development of Alternaria blight on transplants of sweet potato', Acta Horticulturae, vol. 1204, pp. 211-217.en_ZA
dc.identifier.issn0567-7572
dc.identifier.other10.17660/ActaHortic.2018.1204.27
dc.identifier.urihttp://hdl.handle.net/2263/68770
dc.language.isoenen_ZA
dc.publisherInternational Society for Horticultural Scienceen_ZA
dc.rights© 2018 International Society for Horticultural Science. The original publication is available at http://www.actahort.org.en_ZA
dc.subjectAlternaria blight (AB)en_ZA
dc.subjectSweet potatoen_ZA
dc.subjectAlternaria bataticolaen_ZA
dc.subjectDiseasesen_ZA
dc.subjectSouth Africa (SA)en_ZA
dc.subjectDisease assessmenten_ZA
dc.subjectDisease incidenceen_ZA
dc.subjectDisease severityen_ZA
dc.subjectIpomoea batatasen_ZA
dc.titleEffects of wetness duration, inoculum concentration and temperature on the development of Alternaria blight on transplants of sweet potatoen_ZA
dc.typePostprint Articleen_ZA

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