Abstract
The susceptibility of 26 apple cultivars to four bark parasites: <i>Nectria galligena, Pezicula malicorticis, Stereum purpureum</i> and <i>Phytophthora cactorum</i> was investigated. A close correlation was found between indices of susceptibility to the fungi <i>N. galligena, P. malicorticis</i> and <i>S. purpureum</i> and no correlation between the indices of susceptibility to <i>P. cactorum</i> and the three remaining pathogens. Five groups of susceptibility to the complex of bark canker fungi were distinguished, oomprising three or four species of fungi. Highly susceptible cultivars: 'Delikates', 'Melrose', 'Spartan', 'Prima' and 'Slava Pobeditelam'. Rather susceptible cultivars: 'Starkrimson', 'Hibernal', 'Florina', 'Priscilla', 'Priam', 'Macfree' and 'NY 55-158-2'. Moderately susceptible cultivars: 'Macoun', 'Liberty', 'NY 55-140-9', 'Vista Bella', 'Jerseymac' and 'Šampion', Little susceptible cultivars: 'Discovery', 'Empire', 'Fantazja' and 'Primula', But slightly susceptible cultivars: 'Golden Delicious', 'Idared' and 'NY 58-533-1'.
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