INFLUENCE OF NEW POLISH ROOTSTOCKS AND M.9 SUBCLONES ON INDUCED VIGOUR, YIELD AND FRUIT QUALITY OF APPLE CULTIVARS

The experiment was conducted in Central Poland from 1997 to 2002. The influence of new Polish dwarfing and semi-dwarfing rootstocks (from the new P series, recently bred by the Institute of Pomology and Floriculture) as well as subclones of M.9, on growth, yield and fruit quality of grafted ‘King Jonagold’, ‘Elshof’ and ‘Redkroft’ apple cultivars was studied.
The results showed that the new Polish rootstocks: P 61, P 63, P 64 and P 65 decreased tree growth of all cultivars.
The size of these trees was significantly smaller than P 22 (standard). Growth of trees grafted on German rootstock selections: M.9 B.1, M.9 B.2 and M.9 B.3 was similar to those on M.9 EMLA (standard). Among the semi-dwarfing rootstock group, P 67 reduced the vigour of ‘King Jonagold’ and ‘Elshof’ to the same level as M.26. The highest cumulative yield of the three cultivars was obtained from trees grafted on the semi-dwarfing rootstock P 67. Results on productivity (yield efficiency index), revealed that whatever the rootstock, ‘King Jonagold’ cultivar was the most productive.

XI Eucarpia Symposium on Fruit Breeding and Genetics

P. Bielicki, A. Czynczyk, D. Chlebowska

clonal rootstock, dwarfing, growth, Malus sp., yield

https://doi.org/10.17660/ActaHortic.2004.663.174