Horticultural Research (Japan)
Online ISSN : 1880-3571
Print ISSN : 1347-2658
ISSN-L : 1347-2658
Crop Production & Cropping Type
Labor-saving Cultivation of Japanese Pear ‘Kosui’ using Fruit Set Induction by Bordeaux Mixture
Taishi HayashidaKazuyoshi NadaShin Hiratsuka
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2015 Volume 14 Issue 4 Pages 357-363

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Abstract

To develop the labor-saving cultivation of ‘Kosui’ (Pyrus pyrifolia Nakai), heavy metal application was conducted to induce fruit set without pollination. Bordeaux mixture containing 5.9 mM Cu2+ and 2 mM FeSO4 caused 20–30% parthenocarpic fruit set, respectively, on applying them 8 days before anthesis. Based on these findings, we identified some problems related to fruit set and development resolvable by heavy metals in this study. Firstly, we confirmed that the fruit set induction by Bordeaux was not different between spur and long bearing shoots. The fruit became suitable for market by treating it with GA paste 30 days after anthesis (DAA), and one fruit per cluster was shown to be appropriate. When the cultivation system was investigated in the orchard, the yield was almost the same as with conventional cultivation and the harvest time became much earlier. Thus, labor-saving cultivation of ‘Kosui’ pear may be possible by heavy metal application before anthesis, especially with Bordeaux mixture, because no artificial pollination, no pesticide application before anthesis, and almost no fruit thinning are necessary.

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© 2015 by Japanese Society for Horticultural Science
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