Effects of different soil treatments on the development of Spongospora subterranea f. sp. subterranea in potato roots and tubers in the greenhouse

dc.contributor.authorSimango, Kenedy
dc.contributor.authorVan der Waals, Jacqueline Elise
dc.contributor.emailjacquie.vanderwaals@up.ac.zaen_ZA
dc.date.accessioned2017-06-27T08:40:49Z
dc.date.issued2017-03
dc.description.abstractPowdery scab caused by Spongospora subterranea f. sp. subterranea (Sss) causes extensive losses in potato production systems globally. Two pot experiments were established in the greenhouse in summer 2013 and winter 2014 to evaluate the effectiveness of different soil chemicals, fumigant, amendments and biological control agents (BCAs) against Sss in the rhizospheric soil, potato roots and tubers. The study used visual assessment methods to assess the effect of treatments on root galling and zoosporangia production, and qPCR to measure Sss concentration in the soil and in the potato roots and tubers. All six soil treatments, namely metam sodium, fluazinam, ZincMax, calcium cyanamide, Biocult and a combination of Bacillus subtilis and Trichoderma asperellum recorded significantly (P < 0.05) lower numbers of zoosporangia in the roots compared to the untreated control. The same effect was observed on the concentration of Sss DNA in the roots at tuber initiation. A more diverse picture was obtained when root gall scores at tuber initiation and Sss DNA in the rhizospheric soil at tuber initiation and harvesting were compared. Significant differences (P < 0.05) were also noted in disease severity, disease incidence, and tuber yield between metam sodium, fluazinam, ZincMax, calcium cyanamide and the untreated control. Calcium cyanamide gave the highest tuber yield. The study demonstrated the potential of soil treatments such as metam sodium, fluazinam, ZincMax and calcium cyanamide in managing Sss in potatoes by reducing the pathogen both in the rhizospheric soil and the roots of the potato plant.en_ZA
dc.description.departmentPlant Production and Soil Scienceen_ZA
dc.description.embargo2018-03-30
dc.description.librarianhj2017en_ZA
dc.description.sponsorshipThe National Research Foundation (NRF), South Africa, and Potatoes South Africa.en_ZA
dc.description.urihttp://link.springer.com/journal/11540en_ZA
dc.identifier.citationSimango, K. & van der Waals, J.E. Effects of different soil treatments on the development of Spongospora subterranea f. sp. subterranea in potato roots and tubers in the greenhouse. Potato Research (2017) 60: 47-60. doi:10.1007/s11540-017-9340-5.en_ZA
dc.identifier.issn1871-4528 (online)
dc.identifier.issn0014-3065 (print)
dc.identifier.other10.1007/s11540-017-9340-5
dc.identifier.urihttp://hdl.handle.net/2263/61119
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.subjectBiological controlen_ZA
dc.subjectControlen_ZA
dc.subjectManagementen_ZA
dc.subjectPotatoen_ZA
dc.subjectPowdery scaben_ZA
dc.subjectSoil amendmenten_ZA
dc.subjectSpongospora subterranea f. sp. subterraneaen_ZA
dc.subjectBiological control agent (BCA)en_ZA
dc.titleEffects of different soil treatments on the development of Spongospora subterranea f. sp. subterranea in potato roots and tubers in the greenhouseen_ZA
dc.typePostprint Articleen_ZA

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