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In this study, we evaluated the differences in fruit development and quality indices of fruits subjected to blossom thinning before full bloom in ‘Hanareum’ and ‘Niitaka’ pears (Pyrus pyrifolia Nakai). We carried out a thinning treatments at 5 days before full bloom, targeting the blossoms at the 1st and 2nd position (T1) or the blossoms at the 6th and 7th position (T2) from the basal part of the flower cluster in both cultivars. Blossom thinning treatments increased the average fruit weight of early-season Asian pear ‘Hanareum’ up to 10.5% (T1) and 11.0% (T2) at harvest time (110 days after full bloom). The mid-season ‘Niitaka’ pear showed increased fruit weight of up to 12.6% (T1) and 16.8% (T2) at harvest time (170 days after full bloom). Moreover, these treatments increased the production rate of bigger sized fruits in both cultivars. Removal of blooms also affected fruit quality indices; the bloom-thinned fruits showed higher soluble solids contents (about 1 o Brix) and higher skin color redness (a*) especially in ‘Niitaka’ pears when compared to the non-thinned controls. Overall, the treatments increased the fruit size and weight as well as fruit quality including soluble solids and skin color. Bloom thinning treatment targeting the 6th to 7th blossom from the basal part of the flower cluster may be recommended as the practical thinning method in Asian pear ‘Hanareum’ and ‘Niitaka’. Additional key words: fruit length, fruit diameter, skin color difference, soluble solids *Corresponding author: jpchun@cnu.ac.kr ※ Received 3 March 2015; Revised 30 March 2015; Accepted 1 April 2015.    (PJ007516)   ,   . C 2015 Korean Society for Horticultural Science      2000     2012 14,000ha      9%   .     2000  324,000ton  470,000ton   10a     .     30  ,      13%      ‘’  96%   (KOSTAT, 2012). 2001  ‘’  8 ・            480g (Hwang et al., 2005)       , , , , ,  487 .        .   ‘’               . ‘’  ‘’         .                      (Hayashi, 1960).  ‘’          30            (Kim, 2001).    ‘’                            3-5      (Hayashi and Tanabe, 2002).  ‘’     3-5   500-899g            3-4         (Lee

Comparison of Fruit Development and Quality Indices According to Blossom Thinning on Early-season ‘Hanareum’ and Mid-season ‘Niitaka’ Pears