Folia Horticulturae

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Susceptibility of one-year-old shoots of scab-resistant apple cultivars to low temperatures in laboratory tests during four winters (1999/2000-2002/2003)

Alojzy Czynczyk, Grzegorz Hodun, Małgorzata Hodun, Dorota Kruczyńska

Research Institute of Pomology and Floriculture
Pomologiczna 18, 96-100 Skierniewice, Poland
e-mail: a.czynczy@insad.pl

One-year-old shoots from 15 scab-resistant apple cultivars grafted on M.9 were frozen artificially at temperatures from -15°C to -35°C during four successive winters from 1999/2000 to 2002/2003. During the winter of 1999/2000 the shoots were tested only once, in the next two winters 3 times, and twice in the winter of 2002/2003. All the trees from which the shoots were collected were planted in the orchard in the spring of 1995. The injuries caused by low temperatures were assessed by means of a survival test. The results obtained showed that the damage of one-year-old shoots depended mainly on the degree of hardiness of the trees during the dormant period and the cultivar. The injuries suffered by the shoots after freezing during the four successive winters (1999-2003) showed that the cultivars ‘Florina’, ‘Ligolina’, and ‘Ligol’ had winter hardiness similar to that of the standard cultivar ‘Novamac’. The remaining cultivars were more susceptible to low temperatures than ‘Novamac’. All the cultivars had lower winter hardiness at the end of the mild winters of 2001 and 2002 in comparison with the more severe 2003 one.

Czynczyk A., Hodun G., Hodun M., Kruczyńska D., 2004. Susceptibility of one-year-old shoots of scab-resistant apple cultivars to low temperatures in laboratory tests during four winters (1999/2000-2002/2003). Folia Horticulturae 16/1: 61-72.