American Potato Journal

, Volume 39, Issue 4, pp 152–161 | Cite as

Studies on the nature of field resistance of the potato to late blight

  • Kenneth W. Knutson


The relative resistance to late blight in the field of potato varieties Pontiac, Sebago, and Ostbote was asssociated, in most greenhouse tests, with numbers of infections, size of lesions, and abundance of sporulation. This was not true of the variety Cobbler which in the greenhouse appeared to be resistant, although actually the most susceptible of the four in the field.

Abundance of sporulation was not correlated with size of lesions.

Plants of Pontiac, Sebago, and Cobbler grown in the field and transplanted to pots in the greenhouse were much more susceptible to blight than those planted at the same time but grown continuously in the greenhouse. The field-grown plants had more and larger lesions under standard conditions of inoculation and incubation.


Late Blight AMERICAN Potato Journal Potato Variety Phytophthora Infestans Infected Leaf 


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Copyright information

© Springer 1962

Authors and Affiliations

  • Kenneth W. Knutson

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