Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Occurrence and Analysis of Apple Blotch-like Symptoms on Apple Leaves

  • Back, Chang-Gi (School of Applied Biosciences, Kyungpook National University) ;
  • Lee, Seung-Yeol (School of Applied Biosciences, Kyungpook National University) ;
  • Kang, In-Kyu (Department of Horticultural Science, Kyungpook National University) ;
  • Yoon, Tae-Myung (Department of Horticultural Science, Kyungpook National University) ;
  • Jung, Hee-Young (School of Applied Biosciences, Kyungpook National University)
  • Received : 2014.10.26
  • Accepted : 2015.01.29
  • Published : 2015.06.30
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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.

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References

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