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Abstract

Spongospora subterranea, which causes powdery scab of potato, infects a diverse range of plant species. Crop rotation as a powdery scab management tool will be compromised if pathogen hosts exist between potato crops. Opium poppy (Papaver somniferum) and pyrethrum (Tanacetum cinerariifolium) are important crops within intensive vegetable production rotations in NW Tasmania. Measurements of S. subterranea soil inoculum within a commercial field showed pathogen amounts were substantially elevated following an opium poppy crop, which suggested host status. In glasshouse testing, opium poppy and pyrethrum were confirmed as hosts of S. subterranea, with opium poppy the more susceptible of the two. Both species were less susceptible than tomato, a known host. Observations of early growth suggested inoculation impacts on all three plant species, although at 16 (tomato and opium poppy) or 26 (pyrethrum) weeks postinoculation, only tomato had significantly reduced shoot and root development. The role of rotation crops in inoculum persistence and the possible role of S. subterranea as a minor pathogen of nonpotato crops are discussed.

Item Type:	Article
Authors/Creators:	Clark, TJ and Rockliff, LA and Tegg, RS and Balendres, MA and Amponsah, J and Thangavel, T and Mulcahy, F and Wilson, AJ and Wilson, CR
Keywords:	Spongospora, soilborne pathogen, alternate hosts, potato
Journal or Publication Title:	Journal of Phytopathology
Publisher:	Blackwell Verlag Gmbh
ISSN:	0931-1785
DOI / ID Number:	10.1111/jph.12746
Copyright Information:	© 2018 Blackwell Verlag GmbH
Related URLs:	Google Scholar: Tegg, RS UTAS Profile: Tegg, RS UTAS Profile: Wilson, AJ Google Scholar: Wilson, CR UTAS Profile: Wilson, CR
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