, Volume 45, Issue 3–4, pp 311–315 | Cite as

Effect of light intensity on sporulation of Botryosphaeria ribis

  • D. H. Smith
  • C. L. Fergus


Pycnidia were produced by six of seven isolates ofB. ribis at one or more intensity levels of continuous illumination at 21 °C. Under conditions of alternating light (12 h−27 °C) and darkness (12 h−21 °C) pycnidia formed in cultures of six isolates at three or more intensity levels, while one isolate failed to form pycnidia at any intensity level. Pycnidia did not develop when cultures were incubated in complete darkness. Exposure periods as brief as 2 days under continuous illumination at 21 °C induced pycnidial formation. In alternating light (12 h−27 °C) and darkness (12 h−21 °C), the shortest period of exposure which induced pycnidial formation was 4 days. Continuous illumination at 21 °C favored development of uniloculate pycnidia, while alternating light (12 h−27 °C) and darkness (12 h−21 °C) favored formation of multiloculate pycnidia.


Light Intensity Intensity Level Exposure Period Continuous Illumination Complete Darkness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Bragonier, W. H. (1949) Umbrella disease ofRhus glabra andRhus typhina caused byBotryosphaeria ribis. (Abstr.)Phytopathology 39:3.Google Scholar
  2. 2.
    Carlile, M. J. (1965) The photobiology of fungi.Ann. Rev. of Plant Physiol. 16:175–202.CrossRefGoogle Scholar
  3. 3.
    Cochrane, V. W. (1958) Physiology of fungi. John Wiley and Sons, Inc., New York. 524 p.CrossRefGoogle Scholar
  4. 4.
    Eid, R. F. (1959) Etiology and control ofBotryosphaeria ribis on apple. M. S. Thesis, Univ. of Delaware, Newark, Delaware. 78 p.Google Scholar
  5. 5.
    Fulkerson, J. F. (1957)Botryosphaeria ribis and its relation to a rot of apple. Ph. D. Thesis, North Carolina State College, Raleigh, North Carolina. 79 p.Google Scholar
  6. 6.
    Putterill, V. A. (1919) A new apple tree canker.South Africa J. Sci., 16:258–272.Google Scholar
  7. 7.
    Sayed, M. Q. (1957) Temperature as it effects growth of apple fruit rotting organisms and their response to fungicides. M. S. Thesis, Univ. of Delaware, Newark, Delaware. 36 p.Google Scholar
  8. 8.
    Smith, C. O. (1934) Inoculations showing the wide host range ofBotryosphaeria ribis.J. Agr. Res. 49:467–476.Google Scholar
  9. 9.
    Wolf, F. T. &Wolf, F. A. (1939) A study ofBotryosphaeria ribis on willow.Mycologia 31:217–227.CrossRefGoogle Scholar
  10. 10.
    Stevens, N. E. (1936) A note on the temperature relations of certain fungi.Mycologia 28:510–513.CrossRefGoogle Scholar

Copyright information

© Dr. W. Junk N.V. 1971

Authors and Affiliations

  • D. H. Smith
    • 1
  • C. L. Fergus
    • 2
  1. 1.University of Georgia College of Agriculture Experiment Stations, Georgia Station, ExperimentUSA
  2. 2.Botany Section, Department of BiologyThe Pennsylvania State UniversityUniversity Park

Personalised recommendations