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Timing of Nectria galligena infection of apple shoots and its influence on the development and destructiveness of European canker of pome fruits

Marek Grabowski

Department of Pplant Protection
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland

The purpose of the studies was to evaluate the effect that the timing of infection has on the development and destructiveness of European canker of pome fruits on apple trees. Field tests were carried out in the years 1985-1988 on 3-year McIntosh apple whips at RZD Mydlniki near Cracow. On the basis of results obtained, it was found that the progress of the disease and type of symptoms vary according to the period in which the apple shoots were infected.

The most serious damage is done to the trees when they are infected in the autumn (September to November) or winter (December to February). Summer infections are less damaging, leading to the development of smaller lesions.

Grabowski M., 1990. Timing of Nectria galligena infection of apple shoots and its influence on the development and destructiveness of European canker of pome fruits. Folia Horticulturae II/2: 113-122.