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http://dx.doi.org/10.7235/hort.2013.12109

Influence of Seasonal incidence and Defoliation Degree of Marssonina Blotch on Fruit Quality and Shoot Growth of 'Fuji'/M.9 Apple Tree  

Park, Moo-Yong (Apple Research Station, National Institute of Horticulture & Herbal Science, Rural Development Administration)
Sagong, Dong-Hoon (Apple Research Station, National Institute of Horticulture & Herbal Science, Rural Development Administration)
Kweon, Hun-Joong (Apple Research Station, National Institute of Horticulture & Herbal Science, Rural Development Administration)
Do, Yun-Su (Apple Research Station, National Institute of Horticulture & Herbal Science, Rural Development Administration)
Song, Yang-Yik (Apple Research Station, National Institute of Horticulture & Herbal Science, Rural Development Administration)
Lee, Dong-Hyuk (Technology Cooperation Bureau, Rural Development Administration)
Publication Information
Horticultural Science & Technology / v.31, no.5, 2013 , pp. 523-530 More about this Journal
Abstract
This study investigated the influence of seasonal incidence and defoliation degree caused by Marssonina blotch (Diplocarpon mali Harada et Sawamura) on shoot growth and fruit quality of 'Fuji'/M.9 apple tree. The occurrence of marssonina blotch in Gunwi region was observed from the mid of July 2009, and percentage of defoliation was about 10% in the end of October. In 2010, that started in the early of June. By the end of September, percentage of defoliation was 20% and it reached 50% in late October. Secondary growth of terminal shoot in 2010 was three times as much as that in 2009. In 2009, the soluble solid contents and the red color (hunter a value) during fruit maturation increased to $13.8^{\circ}Brix$ and 16.2, respectively. In 2010, the soluble solid content during fruit maturation remained in the $12.1-12.6^{\circ}Brix$ range after early October, and the red color began to increase after the end of September when the percentage of defoliation was 20%. As for fruit quality by defoliation degree, the red color decreased when defoliation percentage of bourse shoot at the end of October was more than 30%. Fruit weight and soluble solids also decreased when defoliation percentage was more than 50%. Fruit length and diameter of over 30% defoliation treatments begun to decrease after the middle of August, compared with those of under 30% defoliation treatment. Photosynthetic rate of the leaves that was located at the secondary growth of bourse shoot was similar to that of leaves which was located at the middle of bourse shoot. However, the size and the soluble solid content of fruit were not affected by photosynthesis activities of bourse shoot leaves which was develop in the secondary shoot growth.
Keywords
Diplocarpon mali; fruit growth; Malus domestica Borkh.; photosynthesis; secondary shoot growth;
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Times Cited By KSCI : 6  (Citation Analysis)
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