Volume 56 Number 3 Article 24
Year 2002 Month 7
Title: Benzyladenine and Other Thinning Agents for Pear cv. 'Clara Frijs'
Author: M.G. Bertelsen
Abstract:
Various chemical thinning treatments were applied to 'Clara Frijs' pear trees. 1-naphthylacetic acid
(NAA) sprayed with twice the normal concentration (45 mg/L) did not reduce fruit set significantly, but
fruit size distribution was improved.
ATS was applied in concentrations of 0.5, 1 and 2%, and only the
two highest concentrations reduced fruit set.
Leaf damage was pronounced after 1 and 2% ATS application resulting in no improvement in fruit size and severe reductions in return bloom.
A mixture of
NAA and urea had no thinning effect. 6-Benzyladenine (BA) proved to be the most efficient thinner of
'Clara Frijs' when used in rates of 100 mg/L, fruit set was reduced and the number of large fruit was improved to the same extent as was obtained with the hand-thin treatment.
Return bloom was significantly improved compared to all other treatments including hand thinning.
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