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Post Harvest Diseases :: Fruits :: Apple
Apple scab: Venturia inaequalis
Symptoms:
  • Small, rough, black, circular lesions on their skin
  • Fruits after keeping in cold storage.
  • Affected fruits rot due to secondary infection of the lesions
  • Ascus is slightly spatulate  in shape
  • Ascospores are 2-celled, yellowish with the upper cell shorter and sowewhat wider than the lower cell, oval shaped
  • low temperatures of 4 and 8°C favours for the development of disease.
Black circular lesions on skin Enlarge spots Ascospores

Management:

  • Infected spurs and cankers should be pruned during summer.
  • Affected fruits whether on trees or fallen on the ground should be collected and buried in the soil.
  • Diseased mummies should be ploughed into the soil.

Image source:

http://www.apsnet.org/edcenter/intropp/lessons/fungi/ascomycetes/Pages/AppleScab.aspx
http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7413.html
http://www.agf.gov.bc.ca/cropprot/tfipm/applescb.htm

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