Volume 54 Number 4 Article 38 Pages: 199-207
Year 2000 Month 10
Title: A Multi-site Pear-interstem Trial in the Netherlands and Belgium
Authors: S.J. Wertheim and J. Vercammen
Citation
Abstract:
An interstem trial was planted in the spring of 1989 with two pear cultivars 'Conference' and
'Doyenne du Comice' on the tender Quince MC rootstock with six interstem cultivars, viz. 'Beurre
d'Anjou,' 'Beurre Hardy' (standard), 'Doyenne du Comice,' 'Nouveau Poiteau,' 'Old Home' and 'Flemish Beauty' to determine the influence of the interstems on winter hardiness and growth control.
Two-year-old trees budded directly on Quince MC served as controls.
The trees were planted at two sites in
The Netherlands and one in Belgium in single rows at distances ranging from 3.00 m × 1.30 m to 3.50 m × 1.50 m and trained as slender spindles.
The trial was evaluated until 1998.
No damaging freezes occurred during the experimental period, therefore no conclusions could be
drawn with regard to the winter hardiness of the interstem cultivars involved.
Vigor control was obtained with 'Beurre d'Anjou' and 'Flemish Beauty,' probably as a result of incompatibility of these two
interstem cultivars with the Quince MC rootstock.
The interstems compatible with the Quince MC rootstock
did not provide vigor control, or promoted it, as was the case with 'Old Home.' The 'Old Home'
interstem reduced cropping. 'Nouveau Poiteau' had a small negative effect on the fruit size of 'Conference.' 'Beurre Hardy' and 'Doyenne du Comice' are useful interstems for Conference, but do not reduce vigour.
For 'Doyenne du Comice,' with the exception of the poorly compatible interstems, none
of the other interstems studied reduced vigor.
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