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Non-pathological disorder

Diagnostic characters for visual diagnosis

• Orange brown superficial discoloration, irregular in shape.
• Lesions have a distinct but irregular margin.
• Individual lesions may extend up to half of the tuber
• Lesions occur more frequently on the underside of tubers in the furrow
• Symptoms are normally present at harvest and do not develop further
• No fungal structures are associated with lesions 

Notes on confirmatory diagnostics

• As a non-pathological disorder, no pathogens can be observed associated with lesions even after incubation
• Equally, attempts to isolate from lesions onto agar fails to produce a recognised pathogen

Specific references:

Hide et al (1994). Annals of Applied Biology, 124,253- 265

Hide et al (1994). Potato Research 37, 169-172.                                         

Silver scurf

Black dot

Other discolorations