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First Report of Powdery Mildew Caused by Phyllactinia fraxini on Chinese Fringe Tree in Korea
김창전,이향범,장형열,Dean A. Glawe,신현동 한국식물병리학회 2011 Plant Pathology Journal Vol.27 No.1
During 2008 and 2009, a powdery mildew disease was observed on the leaf of a Chinese fringe tree (Chionanthus retusus Lind. & Paxt.)at the campus of Chonnam National University, Gwangju, Korea. Symptoms included white superficial mycelia and a large number of necrotic black spots on leaf (Fig. 1). Mature cleistothecia (chasmothecia) with penicillate cells have transparent tapering appendages with a bulbous base. The size of the cleistothecia ranged from 218.4−262.8 (av. 237.1) μm. Cleistothecia contained 10 to 15appendages and formed a gelatinous mass of penicillate cells. The size of the tapering appendages and bulbous base were 137.0−268.1(av. 191.6) × 4.6−7.8 (av. 6.2) μm and 25.1−34.4 (av. 31.0) μm in diameter, respectively. 18S rDNA sequence analysis by BLASTN search indicated that our EML-PHYL1 (GenBank accession no. HM560023) isolate was closest to a Phyllactinia species, P. fraxini (GenBank accession no. AB080549) with 99% identity value,comprising of a Fraxini clade (Fig. 2). P. fraxini has been found on 67hosts containing Alnus spp., Bauhinia spp., Chionanthus virginicus,Fraxinus spp., Magnolia spp. and Syringa spp. (Farr and Rossman,2010; Takamatsu et al., 2008). In Korea, the species was reported to cause powdery mildews only on Fraxinus mandshurica, F. rhynchophylla and Magnolia kobus.
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문혜연,이향범,Je Yong Jeong,김창전 한국식물병리학회 2012 Plant Pathology Journal Vol.28 No.1
In August 2010, a severe crown rot was observed on chrysanthemum (Chrysanthemum morifolium Ramat.,variety Sinro) in several greenhouses located at Damyang and Muan, Jeonnam province, Korea. Three isolates (EML-CHS1, -CHS2, and -CHS3) of Fusarium were isolated from the affected plants and identified based on morphological characteristics and rDNA internal transcribed spacer (ITS) sequence analysis. Sequence analysis by BLAST indicated that EMLCHS1,-CHS2 and CHS3 were closest to a Fusarium species, F. solani with > 99% sequence similarity. Pathogenicity tests were performed on chrysanthemum with spore suspensions containing 3.4 × 106 spores/ml using the dipping method. Ten days after inoculation, similar symptoms to those observed in the greenhouses were seen on the inoculated plants. The causal fungus was reisolated from the artificially inoculated basal stems,fulfilling Koch's postulates. To our knowledge, this is the first report of crown rot by Fusarium solani on chrysanthemum (Chrysanthemum morifolium) in Korea.
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