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Potato tuber blemishes: understanding & diagnosis

Other superficial symptoms

Corky lesions with halo

Corky lesions with halo

Visual diagnosis

  •  Scab-like pale brown lesions with halo

Putative causes

  •  Tobacco necrosis virus (TNV)
  •   R. solani (AG5)
  •   Streptomyces spp.

Corky lesions without halo

More unknown corky symptoms

Visual diagnosis

  • Star-shaped cracks, without halo

Cause

  • Unknown 

Corky spot

corky spot

Visual diagnosis

  • The lesions form little corky patch

Putative causes

  • R. solani or Streptomyces spp.

The implication of these pathogens for such symptoms has not yet been demonstrated

Corky plates

other corky 3

Visual diagnosis

  • The lesions form  large corky plates

Putative causes

  • R. solani or Streptomyces spp.

The implication of these pathogens for such symptoms has not yet been demonstrated

Possible confusing symptoms :