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http://dx.doi.org/10.5423/RPD.2011.17.3.386

Occurrence of Downy Leaf Spot on Juglans regia Caused by Microstroma juglandis in Korea  

Lee, Sang-Hyun (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute)
Lee, Seung-Kyu (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute)
Park, Ji-Hyun (Division of Environmental Science and Ecological Engineering, Korea University)
Cho, Sung-Eun (Division of Environmental Science and Ecological Engineering, Korea University)
Shin, Hyeon-Dong (Division of Environmental Science and Ecological Engineering, Korea University)
Publication Information
Research in Plant Disease / v.17, no.3, 2011 , pp. 386-390 More about this Journal
Abstract
In June 2011, walnuts (Juglans regia) from orchards in Kimcheon and Muan, in southern Korea, were found to exhibit downy mildew-like symptoms of a foliar disease. Whitish polygonal efflorescence was produced on the abaxial surface of affected leaves and discolored light green blotches on the corresponding adaxial surfaces. In the later stage of disease development, diseased tissues collapsed and became necrotic. Based on morphological and cultural characteristics, the causal fungus was identified as Microstroma juglandis. The sequence of ITS rDNA of the present isolate showed 100% similarity with those of M. juglandis obtained from GenBank databases, thus confirming its identity. Pathogenicity tests were conducted on leaves of walnut seedlings, fulfilling Koch's postulates. The disease has been previously reported in North America, Europe, Oceania and some western Asia. This is the first report of downy leaf spot on walnuts in East Asia.
Keywords
Downy leaf spot; Juglans sinensis; White mold;
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