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• W2890873528 abstract "HomePlant DiseaseVol. 103, No. 1First Report of Powdery Mildew Caused by Podosphaera tridactyla on Prunus davidiana in Korea PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Powdery Mildew Caused by Podosphaera tridactyla on Prunus davidiana in KoreaC. H. Jeon, S. H. Kang, W. I. Choi, and H. D. ShinC. H. JeonSearch for more papers by this author, S. H. KangSearch for more papers by this author, W. I. ChoiSearch for more papers by this author, and H. D. Shin†Corresponding author: H. D. Shin; E-mail: E-mail Address: [email protected]http://orcid.org/0000-0002-7778-2747Search for more papers by this authorAffiliationsAuthors and Affiliations C. H. Jeon S. H. Kang W. I. Choi , Warm-Temperate and Subtropical Forest Research Center, National Institute of Forest Science, Seogwipo 63582, Korea H. D. Shin † , Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Korea. Published Online:14 Nov 2018https://doi.org/10.1094/PDIS-05-18-0712-PDNAboutSectionsSupplemental ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat Prunus davidiana Carr., native to China and Korea, is a wild species that is phylogenetically related to peach (Prunus persica). The gene pool of P. davidiana is used for a breeding program of peach varieties (Eremin and Eremin 2011). In Korea, it is a minor crop for harvesting immature green fruits used for beverages with a high content of organic acids. In July 2015, powdery mildew symptoms were observed on leaves of P. davidiana growing wild in Seoul, Korea (37°35′32″N; 127°01′45″E). Similar symptoms have been found in Gangneung, Busan, and Jeju of Korea. White superficial mycelia and conidia were present on both sides of the leaves and young stems. Severe infections caused cupping and malformation of the leaves. The powdery mildew lesions with mature chasmothecia were observed in November. No fruit infection was found during our field foray. Three representative voucher specimens were deposited in the Korea University herbarium (KUS-F28683, F29032, and F29093). Hyphae were 4 to 7 μm wide and had nipple-shaped appressoria. Conidiophores were 100 to 220 × 9 to 11 μm and produced two to eight immature conidia in chains with a crenate outline. Conidia were ellipsoid-ovoid, 30 to 46 × 14 to 20 μm, and had conspicuous fibrosin bodies. Germ tubes were produced at the side of conidia. Chasmothecia were amphigenous, scattered, spherical, and 84 to 104 µm in diameter. Chasmothecial appendages were two to five in number, positioned in the upper half, stiff or slightly curved, one- to four-septate, and had branched apices with three to five bifurcations. Each chasmothecium contained a single ascus and had a terminal oculus 20 to 26 µm wide. Asci were sessile, 60 to 90 × 60 to 74 μm, and contained eight ascospores, each 22 to 30 × 14 to 17 µm. These features were consistent with the description of Podosphaera tridactyla (Wallr.) de Bary (Braun and Cook 2012). The sequence analyses of the internal transcribed spacer (ITS) region of ribosomal DNA of three samples were performed to confirm identity. The resulting amplicons were amplified using primers ITS1/ITS4. The resulting sequences were deposited in GenBank (619 bp for MH271212, 706 bp for MF271213, and 1,072 bp for MH271214). A BLAST search in GenBank using these sequences revealed >99% similarity with those of P. tridactyla on Prunus species (e.g., AB000943, AY833652, and KY661048), which are clustered in clade 2 (cf. Cunnington et al. 2005). Pathogenicity was confirmed by pressing a diseased leaf onto young leaves of three asymptomatic trees. Three noninoculated trees were used as controls. Inoculated leaves developed symptoms after 10 days, whereas the control trees remained symptomless. The symptoms observed on the inoculated leaves were identical to those observed on the diseased leaves. Powdery mildew of P. davidiana associated with P. tridactyla has been recorded in China (Farr and Rossman 2018), and thus first in Korea. Although the economic importance of this disease is currently limited, the presence of powdery mildew could be informative to the breeding program of Prunus spp. and cultivation of P. davidiana in Korea.References:Braun, U., and Cook, R. T. A. 2012. Taxonomic Manual of the Erysiphales (Powdery Mildews). CBS Biodiversity Series No. 11. CBS, Utrecht, the Netherlands. Google ScholarCunnington, J. H., et al. 2005. Mycol. Res. 109:357. https://doi.org/10.1017/S0953756204002072 Crossref, Google ScholarEremin, G. V., and Eremin, V. G. 2011. Russ. Agric. Sci. 37:290. https://doi.org/10.3103/S1068367411040057 Crossref, Google ScholarFarr, D. F., and Rossman, A. Y. 2018. Fungal Databases, Syst. Mycol. Microbiol. Lab., ARS, USDA. Retrieved 27 April 2018 from https://nt.ars-grin.gov/fungaldatabases/. Google ScholarDetailsFiguresLiterature CitedRelated Vol. 103, No. 1 January 2019SubscribeISSN:0191-2917e-ISSN:1943-7692 Metrics Article History Issue Date: 4 Jan 2019Published: 14 Nov 2018First Look: 5 Sep 2018Accepted: 21 Aug 2018 Pages: 158-158 Information© 2019 The American Phytopathological SocietyCited byPodosphaera tridactyla (powdery mildew of apricot)CABI Compendium, Vol. CABI CompendiumRe-Evaluation of the Podosphaera tridactyla Species Complex in Australia26 February 2021 | Journal of Fungi, Vol. 7, No. 3" @default.
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• W2890873528 title "First Report of Powdery Mildew Caused by <i>Podosphaera tridactyla</i> on <i>Prunus davidiana</i> in Korea" @default.
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