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.
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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 |