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KMID : 0903619970380030234
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Journal of the Korean Society for Horticultural Science
1997 Volume.38 No. 3 p.234 ~ p.237
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The Nature of Early Drop of ´ Sekaiichi ´ Apple Fruit
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Abstract
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Characteristics of early fruit drop of ´Sekaiichi´ apples was investigated. Percent initial fruit set of ´Sekaiichi´ by open pollination was 20%, whereas ´Fuji´ and ´Tsugaru´ apple trees were 67% and 50%, respectively. Percent initial fruit sets of ´Sekaiichi´ apple trees by hand pollination during 0-5 days after anthesis were also lower than those of ´Fuji´ apple trees even at any pollination date. Especially, the percent fruit sets of ´Fuji´ apple trees pollinated at 3rd and 4th days of anthesis were 26% and 46% higher than those of ´Sekaiichi´ apple fruit trees. Early fruit drop of ´Sekaiichi´ apples after initiall fruit set initiated from 16 days after full bloom (AFB) and then continued for about 20 days. The most fruit drop (95%) occurred from 21 to 32 days AFB. The diameter of developing fruits during this peak period were 12.6-24.1㎜, whereas those of growth-ceased fruits were 8.0-11.3㎜. The fruits began to abscise at 8-11 days after the growth of fruits ceased.
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