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Deckers T.,PCFruit Research Station for Fruit Growing | Schoofs H.,PCFruit Research Station for Fruit Growing | Verjans W.,PCFruit Research Station for Fruit Growing
Acta Horticulturae | Year: 2010

Fruit thinning of apples is an important measure in modern orchard management of intensive apple growing. Recently the standard compound Carbaryl, has been removed from the spraying program in most European countries. This leads to an urgent need to search for alternative chemicals to realise a reliable fruit thinning on apple and pear. Most of the new apple cultivars in Belgium are diploid: Rubens, Junami and Wellant within the Inova group of new apple cultivars, Kanzi, Greenstar and Zari within the group of the Better3Fruit apple cultivars, Belgica within the BFV apple cultivars. The need for fruit thinning on these varieties is high and if the chemical fruit thinning strategies are not efficient, there will be an important amount of hand labour necessary to avoid the natural biennial bearing tendency. In production area where frost can interfere regularly with the natural fruit set tendency, it is interesting to have a fruit thinning compound that can be applied some weeks after full bloom at a fruitlet diameter of 12 mm or later. Some results with the new fruit thinning compounds 6-BA and metamitron applied on apple will be presented in this paper. Source

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