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Occurrence and Analysis of Apple Blotch-like Symptoms on Apple Leaves
Chang-Gi Back14
,
Seung-Yeol Lee1
,
In-Kyu Kang2
,
Tae-Myung Yoon2
,
Hee-Young Jung13*
1School of Applied Biosciences, Kyungpook National University
2Department of Horticultural Science, Kyungpook National University
3Institute of Plant Medicine, Kyungpook National University
4Horticultural and Herbal Crop Environment Division, National Institute of Horticultur and Herbal Science (RDA)
*교신저자. *Corresponding Author. 
30 June 2015. pp. 429-434
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Abstract

Apple blotch-like symptoms (ABLS) were observed on ‘Fuji’ apple leaves in Cheongsong, Gunwi and Yeongcheon apple orchards located in Gyeongbuk Province during 2010-2014. Characteristics of ABLS were yellowing, brown spots on leaves, and defoliation, similar to apple blotch diseased (ABD) leaves, which are infected with Marssonina coronaria. It is difficult to differentiate by eye between ABLS and ABD, which has led to misdiagnosis and overuse of fungicides. The present study was conducted to investigate the cause of ABLS using stereomicroscopy, culture isolation, cross-sectional analysis of leaves, and PCR. No acervuli were found on the surface of ABLS leaves and no growth was observed on potato dextrose agar (PDA) plates in culture. Furthermore, cross-sectional analysis revealed similar results, and mycelia were absent in ABLS leaves. By contrast, all these characteristics were present in ABD leaves. Furthermore, no fungi or viruses were detected in ABLS leaves by PCR, suggesting that the disease is not caused by these agents. These findings suggest that ABLS might be a physiological disorder in plants that is distinct from ABD.

Keywords
acervuli
apple blotch disease
‘Fuji’ apple
M. coronaria,
stereomicroscopy

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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 33
  • No :3
  • Pages :429-434
  • Received Date : 2014-10-26
  • Revised Date : 2015-01-23
  • Accepted Date : 2015-01-29
  • DOI :https://doi.org/10.7235/hort.2015.14179
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