Vol. 85 No: 1

Title:
Uniconazole reduces fruit set and hand-thinning, and increases fruit size in 'Canino' apricot (Prunus armeniaca L.)

Authors:
AMIR RAZ, MARTIN GOLDWAY and RAPHAEL A. STERN

pp: 30-34

Abstract:
The commercial apricot cultivar ‘Canino’, grown in Israel, is self-compatible and therefore sets large numbers of small fruit. Chemical thinning of blooms and fruitlets is not efficient in stone fruit, therefore hand-thinning of fruitlets has become normal commercial practice, although this is expensive, time-consuming, and not efficient. During 2006 – 2008, applications of uniconazole [a.i., E-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl-1-penten-3-ol)] at 50 – 100 mg l^-1 [0.1 – 0.2% (v/v) Magic™] at 30% of full bloom (FB), reduced fruit-set by approx. 50%. As a result, the time spent in hand-thinning was reduced, the crop load was reduced, and a larger fruit size was achieved (i.e., an 80 – 100% increase in fruit > 50 mm). No impairment in return bloom the following year was observed.

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