An architectural analysis of pear cultivars grown under South African conditions and the relevance to local maintenance pruning strategies.
Date
2005
Authors
Cook, Nigel C.
Du Plooy, Pierre
Journal Title
Journal ISSN
Volume Title
Publisher
International Society for Horticultural Science -- ISHS
Abstract
To quantify the growth habit of locally important pear varieties, initially, 2-
year-old pear branches were classified into groups based on the length and position
of lateral shoots. Four groups were formed that ranged from cultivars with a
spurred growth habit and strong apical control, to cultivars with a spreading growth
habit and weak apical control. Secondly, the development of fruiting branches was
observed for up to five years by observing the five developmental alternatives of the
terminal buds of laterals, i.e., dormant, vegetative, reproductive without fruit,
reproductive with fruit, and abortion. Under local conditions two general problems
were observed. A large proportion of buds remain vegetative giving rise to poor
flowering, and many buds remain dormant, probably due to the use of vigorous
rootstocks and inadequate winter chilling. Local training systems address these
shortcomings through the use of rest-breaking agents, girdling, and winter pruning
techniques. Winter pruning strategies for locally important cultivars can be split
into two broad approaches. In one approach spurs are renewed within spur systems
primarily via bourse shoots. In the other approach spurs are renewed via year-old
shoots. The motivation for the use of these systems is discussed in light of the above
architectural findings.
Description
The original publication is available at http://www.actahort.org/books/671/671_62.htm
Keywords
Pyrus communis (Pears) -- Pruning strategies, Pears -- Fruiting habit
Citation
Cook, N.C. & Du Plooy, P. 2005. An architectural analysis of pear cultivars grown under South African conditions and the relevance to local maintenance pruning strategies. Acta Hort. (ISHS) 671:443-450.