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Multiple Applications of Lime Sulfur for Fruit Thinning of 'Fuji' and 'Hongro' Apple Trees  

Chun, Ik-Jo (School of Bioresource Sciences, Andong National University)
Zheng, Wei-Wei (School of Bioresource Sciences, Andong National University)
Choi, Cheol (Division of Plant Biosciences, Kyungpook National University)
Song, Yang-Yik (Apple Experiment Station, NIHHS, R.D.A.)
Kwang, In-Kye (Division of Plant Biosciences, Kyungpook National University)
Hirst, Peter (Department of Horticulture and Landscape Architecture, Purdue University)
Publication Information
Journal of Bio-Environment Control / v.21, no.4, 2012 , pp. 445-451 More about this Journal
Abstract
The thinning effects of lime sulfur either alone or combined with fish oil on two apple cultivars 'Fuji'/M.9 and 'Hongro'/M.9 were investigated during two consecutive seasons. Either 1% or 2% lime sulfur at full bloom decreased the amounts of both terminal and axillary fruits compared with unsprayed 'Fuji' control trees in the first year. However, 1% or 2% lime sulfur did not decrease terminal fruit set in the second year. Only, triple applications of 1% lime sulfur significantly reduced the number of terminal and axillary fruits in both years. Multiple application of 1% lime sulfur was the most effective in thinning of 'Hongro'. In the first year, double or triple applications of 1% lime sulfur was effective in thinning terminal or axillary fruit, but one time applications of 1% or 2% lime sulfur was not reduced axillary fruit in 'Hongro' apple trees. In the second season, all treatments reduced terminal or axillary fruit in 'Hongro' clusters, except single application of 1% lime sulfur. Fish oil did not always improve the thinning effects of lime sulfur in 'Fuji' or 'Hongro' apple trees. None of treatments caused significant russeting in the harvested fruits. Most of thinning treatments had little effect on 'Fuji' or 'Hongro' fruit quality in terms of fruit weight, firmness, soluble solids concentration or titratable acidity.
Keywords
axillary fruit; bloom thinner; full bloom; Malus domestica Borkh;
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