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Effect of paclobutrazol and pinching on growth and fruiting of apple trees. I. Effect on Gloster grown on two rootstocks

Władysław Poniedziałek, Kazimierz Nosal, Stanisław Porębski

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

In the period 1986-1991 an experiment was carried out to determine the effect of paclobutrazol and pinching on the growth and fruiting of Gloster apple trees. Only on MM 106 rootstock after paclobutrazol application was a significant increase in the number of inflorescences found. The girth of the trees tended to decrease when paclobutrazol was used. Paclobutrazol applications depressed the growth of shoots. In some cases a tendency to decrease the percentage of fruit set could be observed. Sprays at a concentration of 500 mg/dm3 resulted in a increased yield of trees on MM 106 rootstock. A similar increase was noted on M 26 rootstock after the application of 4×250 mg/dm3 of paclobutrazol. However, these increases were not significant. Pinching significantly increased the growth of shoots on M 26 but not on MM 106 rootstock. As the result of this treatment a marked tendency to a fall in the yield was observed.

Poniedziałek W., Nosal K., Porębski S., 1992. Effect of paclobutrazol and pinching on growth and fruiting of apple trees. I. Effect on Gloster grown on two rootstocks. Folia Horticulturae IV/2: 69-78.