Phenological Observations and Factor Analysis of ‘Flowering Disorder’ in Japanese Pears Cultivated in Greenhouses in the Asakura Area, Fukuoka Prefecture

Tominaga Akiyoshi, Watanabe Tatsuhiko, Yahata Masaki

doi:10.2503/hrj.18.439

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施設栽培ニホンナシにおける「発芽不良」の現状および要因分析～福岡県の主要ニホンナシ産地である朝倉地域の事例～
シセツサイバイニホンナシニオケル「ハツガフリョウ」ノゲンジョウオヨビヨウインブンセキ : フクオカケンノシュヨウニホンナシサンチデアルアサクラチイキノジレイ

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Abstract

<p>Characteristics of ‘Flowering disorder (erratic flowering)’ in greenhouse-cultivated Japanese pears were investigated from 2014 to 2017 in Fukuoka Prefecture. Trees with 30% or lower flowering rates showed decreases in the fruit number and an infer fruit size, and thus were categorized into the ‘severe’ grade of flowering disorder. We calculated the ‘severe grade tree rate’ as the proportion of trees with a severe grade to the total number of trees in each orchard. When the severe grade tree rate was averaged separately for the orchards without and with heating, the highest rate was 8.6% in 2017 and 16.6% in 2016, respectively. The severe grade tree rate was higher in ‘Kosui’ than ‘Hosui’. In 2016, the severe grade tree rate became lower in greenhouses with the start of vinyl covering of greenhouses. The results suggest that delayed endodormancy breaking is one of the causes of flowering disorder. They also suggest that flowering disorder in greenhouses is influenced by the endodormancy of flower buds.</p>

Journal

Horticultural Research (Japan)

Horticultural Research (Japan) 18 (4), 439-447, 2019

THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE

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