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Advances in the fruit-stock research


, : Advances in the fruit-stock research. Forschungsdienst Sonderheft 16: 481-488

In the severe winters of 1938-40, stock clones of Malus baccata, plums, cherries and pears were not injured by frost. In apples and pears the stock influenced the hardiness of grafted improved vars., but in plums susceptibility depended mainly on the scion. Young trees were more resistant than older ones. Propagation of Prunus mahaleb by green layers in a hotbed have been successful. In vegetative propagation of pear stocks, layer wood pieces 40 cm. long gave better rooting than pieces 20 cm. long. Rooting is improved if the wood is cut immediately after the end of the growing season. Root formation takes place mainly from the callus ring on the lower cut surface. Triploid vars. have been found unsuitable for seedling stocks. Those vars. which produce ostensibly perfect seeds and have formerly been recommended for production of stocks are Rheinischer Bohnapfel, Bohmischer Brummerling and Palmischbirne. Diploid vars. show variable results; seedlings from some vars. produce a uniform number of salable trees from year to year, and others show great fluctuation in type of seedlings produced.

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