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An investigation of the date of sooty blotch primary infection and duration of incubation period for selected apple cultivars

Marek Grabowski, Beata Wrona

Department of Plant Protection
Faculty of Horticulture, Agriculture University in Kraków
29 Listopada 54, 31-425 Kraków, Poland
e-mail: mgrabowski@ogr.ar.krakow.pl

The experiments were conducted in the years 2000-2002 in Garlica near Kraków and Łososina Dolna near Nowy Sącz on the apple cultivars ‘Florina’, ‘Novamac’, and ‘Witos’. The date of primary infection by fungi causing sooty blotch was determined in unsprayed orchards. It was found that the date of infection was different for various regions under investigation. The infection occurred primarily in late June and early July. The earliest infection was recorded for the ‘Novamac’ cultivar. In the Łososina Dolna area the infection occurred earlier due to higher relative air humidity and rainfall. The duration of incubation period was also diversified for cultivars examined in both locations. The shortest period (29 days) was observed for ‘Novamac’ in Łososina Dolna, while the longest one (45 days) for ‘Florina’ in Garlica. It was found that the earlier date of primary infection, the shorter incubation period.

Grabowski M., Wrona B., 2004. An investigation of the date of sooty blotch primary infection and duration of incubation period for selected apple cultivars. Folia Horticulturae 16/1: 73-77.