ISHS Acta Horticulturae 704: X International Workshop on Fireblight
FIRE BLIGHT SUSCEPTIBILITY OF NEW APPLE CULTIVARS AND CLONES FROM POLAND |
| Authors: | P. Sobiczewski, E. Żurawicz, S. Berczyński, M. Lewandowski |
| Keywords: | Erwinia amylovora, Malus x domestica, disease resistance |
| Abstract:
An important goal of the apple breeding program conducted at The Research Institute of Pomology and Floriculture (RIPF) in Skierniewice is to obtain genotypes with high resistance to fire blight. During 2000-2003, a study was performed to evaluate ten apple cultivars and clones (‘Early Freegold’, ‘Free Redstar’, ‘Egeria’, ‘Ligolina’, ‘Medea’, ‘Melfree’, ‘Odra’, ‘Sawa’, D-13 and J-79) grafted on M.9 and P 22 rootstocks. ‘Freedom’ and ‘Florina’ were used as standards for resistance. Succulent shoot tips of 30 trees of each cultivar/rootstock, growing in pots in a greenhouse, were inoculated with a highly virulent strain (Ea 394) of Erwinia amylovora (107 cfu/ml). Observations and measurements of the development and severity of fire blight were performed 6 weeks after inoculation. The susceptibility of the genotypes was evaluated on the basis of the percentage of shoot length necrosis. ‘Free Redstar’ and J-79 were classified as the most resistant, while ‘Egeria’, ‘Ligolina’ and ‘Melfree’ as the most susceptible. Analysis of the distribution of tested trees within 5 susceptibility classes showed that about 80% of individuals of ‘Free Redstar‘ and J-79 were classified to susceptibility class 1 (the most resistant) while only 1.8-8.0% those of ‘Egeria’, ’Ligolina’ and ‘Melfree’ belonged to that class. | |
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