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- Title
Testing the Susceptibility of Some Potato Cultivars to Black Scurf Disease Caused by Rhizoctonia solani Kühn.
- Authors
Abo-Ake, Sally; Naffaa, Walid; Mando, Mohammed Jamal
- Abstract
Rhizoctonia stem canker and black scurf are among the most important diseases associated with potato (Solanum tuberosum L.) cultivation worldwide. Pathogenicity test of 19 isolates of Rhizoctonia solani Kühn obtained from four governorates in Syria revealed that isolates varied in their ability to cause disease with the isolate Rh15 being the most virulent in the development of the disease on potato plant under artificial infection. The relative susceptibility of seven commercial and local potato cultivars against R. solani was tested. The evaluation was based on black scurf severity and the negative impact of the disease on plant growth and expected effect on yield. The tested cultivars showed variable degrees of black scurf severity and consequent plant growth, but no completely immune cultivars were observed. Based on disease index (DI), potato varieties 'Agria', 'Ultra' and 'Labella' were highly susceptible to the disease; 'Spunta' was moderately resistant whereas 'Everest' was the most tolerant. Infection of the most susceptible cultivar "Afamia" resulted in the death of a large number of seedlings, large and deep canker on stems, with no formation of new tubers. Although 'Synergy' was moderately susceptible, and the black scurf incidence was higher than that of 'Everest' and 'Spunta', the loss of tubers weight was not significant compared to the previous two cultivars. The results suggested that use of tolerant and moderately resistant cultivars in Syria may help in reducing the development of black scurf on potatoes.
- Subjects
SYRIA; RHIZOCTONIA solani; CULTIVARS; PLANT diseases; PLANT growth; TUBERS; POTATOES; CANKER (Plant disease)
- Publication
Jordan Journal of Biological Sciences, 2024, Vol 17, Issue 1, p21
- ISSN
1995-6673
- Publication type
Article
- DOI
10.54319/jjbs/170103