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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 418600
Title Thinning 'Elstar' apple with benzyladenine
Author(s) Maas, F.M.
Source In: ISHS Acta Horticulturae 727: X International Symposium on Plant Bioregulators in Fruit Production. - Leuven : ISHS - ISBN 9789066056992 - p. 415 - 421.
Event Leuven : ISHS - ISBN 9789066056992 ISHS Xth International Symposium on Plant Bioregulators in Fruit Production, 2006-11-25
Department(s) Applied Plant Research, Fruit Research Unit
Publication type Contribution in proceedings
Publication year 2006
Abstract ‘Elstar’, the main apple cultivar grown in the Netherlands, requires adequate thinning to reach marketable fruit sizes and to achieve regular yields by preventing alternate bearing. At the moment, chemical thinning of ‘Elstar’ is the only economically feasible way of thinning. Thinning by hand is labour intensive and thus too expensive. Furthermore, hand thinning is usually carried out after June-drop, by which time only increases in fruit size are achieved and no reduction in alternate bearing. Up to 2004, carbaryl was the only effective fruit-thinning chemical Dutch growers had at their disposal. However, carbaryl is no longer officially registered for thinning apples. Thus, another agent for thinning ‘Elstar’ and other apple cultivars is urgently needed. This paper reports on two trials made with the thinning agent MaxCel containing 6-benzyladenine (BA) as the active ingredient. Generally, MaxCel applied at 10-12 mm fruit diameter thinned well, yielded bigger fruits and improved return bloom. However, thinning efficacy of MaxCel was negligible for weak growing trees or branches and increased with the vigour of the tree or branch. Adequate thinning and target fruit sizes were obtained with BA-concentrations in between 100 and 300 mg L-1 active ingredient. Results of thinning on pack-out and fruit quality are also presented.
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