Folia Horticulturae

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Effect of heading summer sprouts on the growth and fruiting of apple trees

Władysław Poniedziałek, Maciej G±stoł, Monika Bieniasz

Department of Pomology
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland

The investigation was carried out in 1989-1995 at the Garlica Murowana Station near Cracow. The apple trees were grown on MM 106 and M 26 rootstocks. Inside the canopy of ‘Jonagold’ and ‘Gloster’ trees sprouts were headed three times after blooming. The treatment reduced the flowering of the trees and the yield of ‘Jonagold’ apples. Also in ‘Gloster’ trees a slight tendency to a reduction in yield could be observed. The heading induced the multiplication of meristems and development of new shoots. Gibberellins produced by young leaves probably stopped the differentiation of flower buds. The practical value of the results is discussed.

Both cultivars had a smaller area of trunk cross section on M 26 than on MM 106. In ‘Jonagold’ apple trees on M26 a smaller number of shoots and their shorter total length were also evidenced.

Poniedziałek W., G±stoł M., Bieniasz M., 2000. Effect of heading summer sprouts on the growth and fruiting of apple trees. Folia Horticulturae 12/1: 3-11.