Dry core

Dry core

Cited causes : balck scurf (Rhizoctonia solani) & wireworms (Agriotes ssp.)

Dry core
Dry core
Dry core

Diagnostic characters for visual diagnosis

  • Restricted brown cavities up to several millimetres deep with a diameter of 3 to 6 mm
  • Injuries caused by wireworm (Agriotes ssp.) or other insectes mean may facilitate the penetration of R. solani into the tuber  and favour the formation of dry core symptoms
  • Infections with the mycelium of R. solani through wounded normal lenticels and lenticels excrescences were successful

Notes on confirmatory diagnostics

  • Confirmation can be made by isolation  of R. solani on culture media (malt streptomycine, water agar, modified ko & Hora medium, etc...), then incubated for 2 to 3 days at 20 °C.

Specific references:

Keiser et al (2012). Potato Research, 55, 59-67

Possible confusing symptoms :

Common scab

Wireworm holes

Slug holes

Rhizoctonia holes

Modification date : 30 May 2023 | Publication date : 25 February 2013 | Redactor : K. Boucheck-Mechiche, C. Chatot , D. Gaucher, Y. Le Hingrat & S. Wale