Late blight (Phytophthora infestans) occurring on stems - a new problem in potato crops
2002
Kapsa, J. (Instytut Hodowli i Aklimatyzacji Roslin w Radzikowie, Bonin (Poland). Oddzial, Zaklad Ochrony Ziemniaka)
The aim of the study carried out in 1995-01 was to determine occurrence and harmfulness of the stem late blight infections. Survey of many potato crops made in 1977-01, around Poland enabled assessment of the incidence of stem blight. Average 69.1 percent of observed crops were affected with stem blight. The stem blight incidence was not connected with the rate of the leaf form of late blight developing on the foliage. Stem form of the disease has appeared more often in the years with less rainfall during June and July. Its occurrence was influenced by micro climate inside potato canopy. Glasshouse experiments confirmed the importance of stem lesions in decreasing tuber yield and increasing tuber infections. Results have shown that tubers contaminated with spores were the least probable source of the stem form of late blight
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