American Potato Journal

, Volume 15, Issue 2, pp 29–34 | Cite as

Building up virulence in phytophthora infestans

  • Donald Reddick
  • Wilford Mills


The virulence ofPhytophthora infestans has been increased by passage through resistant varieties to a point where a number of hybrids which give an immune reaction in comparison with standard varieties were blighted severely. A similar build-up of virulence occurred under wholly natural conditions. A gap exists which has not been bridged either naturally or artificially so that many hybrids still exist which give no reaction whatever when inoculated with cultures of any virulence.

Some speculation is indulged in regarding the case of Champion, the potato-tomato situation in North America, and the occurrence of biological specialization.


Late Blight AMERICAN Potato Journal Phytophthora Infestans Biological Specialization Potato Foliage 
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Literature cited

  1. 1.
    Berg, Anthony. 1926. Tomato late blight and its relation to late blight of potato. West Virginia Agr. Exp. Sta. Bul. 205. 31 pp.Google Scholar
  2. 2.
    Reddick, Donald, and Willard Crosier. 1933. Biological specialization inPhytophthora infestans. Amer. Potato Jour. 10: 129–134.CrossRefGoogle Scholar

Copyright information

© Springer 1938

Authors and Affiliations

  • Donald Reddick
    • 1
  • Wilford Mills
    • 1
  1. 1.Cornell UniversityIthaca

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