Studies on the nature of field resistance of the potato to late blight
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.
KeywordsLate Blight AMERICAN Potato Journal Potato Variety Phytophthora Infestans Infected Leaf
Unable to display preview. Download preview PDF.
- 3.Guzman, J., H. D. Thurston, and L. E. Heidrick 1960. Naturaleza de la resistencia parcial de tres clones de papa allPhytophthora infestans. Agricultura Tropical 16: 88–99.Google Scholar
- 4.Kammerman, N. 1951. Undersökninger rörande Potatisbladmöglet,Phytophthora infestans (Mont.) de Bary II. Sanbaneet mellan Potatisbladsaftens peroxidasaktivitet och Phytophthora resisten. Medd. Vaxskyddsanst, Stockholm 58, 32p. Rev. Appl. Mycol. 31: 78.Google Scholar
- 6.Niederhauser, J. S., J. Cervantes, and L. Servin. 1954. Late Blight in Mexico and its implications. Phytopathology 44: 406–408.Google Scholar
- 7.Schaper, P. 1951 Die Bedeutung der Inkubationzeit für die Zuchtung krautfäuleresistenter Kartoffelsorten. Z. Pflanzenzucht. 30: 292–299. Rev. Appl. Mycol. 31: 139.Google Scholar
- 8.Thurston, H. D. 1957. The culture ofPhytophtora infestans Phytopathology 47: 186.Google Scholar