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Potato tuber blemishes: understanding & diagnosis

Rhizoctonia corky symptoms

Fungus, Basidiomycete

Latin name: Rhizoctoniasolani

Alternative common names : Elephant hide, alligator hide,  fishy skin, turtleback, etc...

Rhizoctonia corky lesions
Rhizoctonia corky lesions
Rhizoctonia corky lesions with cracks
Rhizoctonia corky lesions

Diagnostic characters for visual diagnosis

  • Rough, irregular, netted, crinkled, scaly, crackled shallow, thick russeting sometimes located on a deformation of the tuber or scattered
  • All the symptoms represented on this page were observed on potato tubers grown in soil artificially inoculated with R. solani AG3
  • Similar symptoms may be observed and due to other unknown causes

Notes on confirmatory diagnostics

  • These symptoms are secondary symptoms due to the plant response to the R. solani stress
  • Hyphae of  R. solani  may still be present on newly harvested tubers, it is then possible to isolate the pathogen on malt medium

Specific references :

Campion etal (2003). European Journal of Plant Pathology, 109 (9), 983-992

Daas et al (2013). Plant pathology, Doi: 10.1111/ppa.12139

Fiers M (2010). PHD Thesis, Université de Bourgogne, P 259.

Paavo etal (2006).

Woodhall et al (2011). New Disease reports.23, 31.

more symptoms

Possible confusing symptoms :