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Potato tuber blemishes: understanding & diagnosis

Russet scab

Bacteria, Actinomycete

Latin name : Streptomyces spp.

Russet scub-Beaulieu

Diagnostic characters for visual diagnosis

  • Shallow, brown, corky reticulations irregular in their pattern and not associated with root necrosis

Notes on confirmatory diagnostics   

  • To confirm the diagnostic, several steps must be completed because some saprophytic strains might be isolated together with the pathogenic ones :
    • Isolation of Streptomyces strains on water agar or on other semi selective medium,
    • Selection of the pathogenic strains by testing their pathogenicity on susceptible varieties
    • Identification  of the  species associated with the lesions by sequencing the 16S rRNA gene

Specific references:

Faucher et al (1993). PlantDisease, 77, 1217-20

Harrison MD (1962). AmericanPotatoJournal, 39, 368-387

Kreuze et al (1999). Phytopathology, 89, 462-9

Possible confusing symptoms :