African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Status and symptomatology of early blight (Alternaria solani) of potato (Solanum tuberosum L.) in Kashmir valley

S. A. Ganie1*, M. Y. Ghani1, Qazi Nissar1, Nayeema Jabeen2, Qaisar Anjum3, F. A. Ahanger1 and aadil ayaz1
1Division of Plant Pathology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar, Srinagar – 191 121, India. 2Division of Vegetable Science, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar, Srinagar – 191 121, India. 3Centre for Forest Management Studies, School of Environmental Biology, Awadhesh Pratap Singh University Rewa (M.P), India.
Email: [email protected]

  •  Accepted: 11 September 2013
  •  Published: 24 October 2013

Abstract

Alternaria leaf blight is one of the most important diseases of potato (Solanum tuberosum L.) worldwide. The disease was prevalent in all the potato growing areas of Kashmir valley surveyed during 2009 and 2010. The overall mean disease incidence and intensity ranged from 24.54 to 28.23% and 13.84 to 15.98%, respectively. The highest disease incidence (39.09%) and intensity (22.54%) was recorded in district Budgam. The lowest level of disease was in district Shopian (14.89 and 8.05%, respectively). The pathogen associated with the disease was identified as Alternaria solani (Ellis and Martin) Jones and Grout. In early stages of disease development, small irregular to circular dark brown spots on lower leaves appear, measuring 0.5 mm in size. Upto fourth week of June concentric  rings  form  as  a  result  of irregular growth patterns by the organism in the leaf tissue giving the lesion a characteristic ‘target spot’ or ‘bulls eye’ appearance. The maximum lesion size 7.4 mm was recorded in the second week of August.

 

Key words: Potato, Alternaria solani, survey, disease incidence, symtomatology.