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The importance of the potato tuber disease powdery scab, caused by the zoosporic pathogen Spongospora subterranea f. sp. subterranea, has increased worldwide, and the disease is one of the most important problems facing potato production in some regions. This soilborne pathogen produces many resting spores which can remain dormant for long periods, are(More)
Powdery scab of potato, caused by the plasmodiophorid pathogen Spongospora subterranea f. sp. subterranea, is an increasingly important disease where potatoes are grown in cool/temperate regions. Powdery scab lesions on tubers downgrade their quality as seed, fresh vegetable or processing potatoes, and the disease can severely harm crop productivity.(More)
Ninety-nine potato (Solanum tuberosum) cultivars and 13 breeding lines were assessed in field trials for susceptibility to powdery scab (caused by Spongospora subterranea f. sp. subterranea). The trials wer e carried out over 11 growing seasons (each cultivar/line tested in at least two growing seasons) in soil inoculated with S. subterranea and regularly(More)
Spongospora subterranea f. sp. subterranea causes the potato diseases powdery scab on tubers and galls on roots, and occurs in most potato production areas worldwide. The pathogen was probably introduced to Europe from South America in the 16th century. Three different genotype clusters have been found worldwide: the genetically variable groups from South(More)
Spongospora subterranea f. sp. subterranea (Sss) causes two diseases on potato (Solanum tuberosum), lesions on tubers and galls on roots, which are economically important worldwide. Knowledge of global genetic diversity and population structure of pathogens is essential for disease management including resistance breeding. A combination of microsatellite(More)
Double-stranded RNA (dsRNA) elements are ubiquitous in Rhizoctonia solani. Total dsRNA was randomly amplified from a R. solani isolate (RS002) belonging to anastomosis group-3PT (AG-3PT), associated with black scurf in potato. Assembly of resulting cDNA sequences identified a nearly complete genome of a novel virus related to the genus Mitovirus (family(More)
Induction of resistance in potato to Spongospora subterranea (which causes powdery scab on tubers) was studied in two controlled glasshouse experiments. β-aminobutyric acid (BABA) was applied at different concentrations (1, 2 or 4 mM) to potato plants which were then inoculated with S. subterranea. Amounts of the pathogen in roots and intensity of(More)
Rhizoctonia solani (teleomorph: Thanatephorus cucumeris) is a soil-borne plant pathogenic fungus that has a broad host range, including potato. In this study, the double-stranded RNA (dsRNA) profiles were defined for 39 Rhizoctonia solani isolates representative of two different anastomosis groups (AGs) associated with black scurf of potato in New Zealand.(More)
This study measured effects of Spongospora subterranea soil inoculum levels on disease of potato tubers and roots, determining relationships between amount of sporosorus inoculum at planting, and both root function during plant growth and powdery scab on tubers at harvest. In a series of shadehouse experiments, different amounts of inoculum were applied to(More)
Hairy nightshade (Solanum physalifolium) and black nightshade (S. nigrum) are common weeds in cropping soils and potato crops (S. tuberosum) in New Zealand. Root galls were found on field-grown plants of hairy and black nightshade, and potato. Microscopic examination indicated that small galls (approx. 1 mm diameter) were caused by Meloidogyne fallax and(More)