Volume 57 Number 3 Article 17
Year 2003 Month 7
Title: Influence of Pruning and Interspecific Prunus Hybrid Rootstocks on Tree Growth, Yield, and Fruit Size of Apricot
Author: F. Kappel
Abstract:
In 1991 a trial was established to determine the effect of two interspecific hybrid rootstocks and two
pruning systems on the growth and fruiting of 'Sundrop' apricot.
The rootstocks evaluated were Haggith (standard), M800 (Prunus besseyi x P. sibirica), and Yuksa (P. besseyi x P. armeniaca). The two
pruning systems were Central Leader and Spanish Bush.
At the end of the experiment trees pruned to
the Central Leader were the tallest and had the largest canopy spread.
No difference in trunk cross-sectional area was found between the two pruning systems.
There was no difference in tree height among
the rootstocks, but trees on Haggith had the largest canopy spread and trunk-cross-sectional area and
trees on M800 were the smallest.
Yield was not affected by pruning; however, fruit from the Spanish
Bush system were the smallest.
Trees on Haggith had the highest yield and the largest fruit.
It appears
that the Spanish Bush pruning system may be a satisfactory system for apricots.
The lower yields and
smaller fruit of trees on M800 suggests that it should not be recommended as an apricot rootstock.
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