sdu faculty of forestry journal special edition 2009 - Orman Fakültesi

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SDÜ ORMAN FAKÜLTESİ DERGİSİ Martinez, I., 2003. Eutypella canker clustering and volume loss in the western upper peninsula of Michigan. Northern Journal of Applied Forestry 20, 186-187. Ogris, N., Diminić, D., Piškur, B., Kraigher, H., 2008. First report of Eutypella parasitica causing cankers on field maple (Acer campestre) in Croatia. Plant Pathology 57, 785. Ogris, N., Jurc, D., Jurc, M., 2005. Javorov rak (Eutypella parasitica: Ascomycota: Fungi) na gorskem javorju in maklenu: značilnosti in razlike. Gozdarski vestnik 63, 411-418. Ogris, N., Jurc, D., Jurc, M., 2006. Spread risk of Eutypella canker of maple in Europe. Bulletin OEPP/EPPO Bulletin 36, 475-485. 161
SDU Faculty of Forestry Journal Serial: A, Number: Special Issue, Year: 2009, ISSN: 1302-7085, Page: 162-167 OCCURRENCE OF Pseudomonas syringae ON POPLAR DAMAGED BY NECROSIS AND CANKER ABSTRACT Irmtraut ZASPEL 1* 1 Federal Research Institute for Rural Areas, Forestry and Fisheries (vTI) Institute of Forest Genetics Eberswalder Chausee 3A D-15377 Waldsieversdorf Germany *irmtraut.zaspel@vti.bund.de In poplar and aspen clones, established in a collection with more than 250 different genotypes, in nursery practice as well as in stock plant cultures necrosis and canker symptoms have appeared at 1 – 3 year-old shoots for some years. The injuries occur in winter season are characterized by ring necrosis at shoots, canker and cracking. The most frequent bacteria type that was isolated from damaged clones was identified as Pseudomonas syringae by means of 16S rDNA analysis. The pathogenicity of the isolates was evident at cuttings of eight several poplar clones tested under greenhouse conditions. The deleterious effect was visible at young shoots with symptoms of discoloration and leaf spots as well as blackening and wilting of buds and young shoots. The eight poplar genotypes differently responded to bacterial infection. Keywords: Populus, stem necroses, canker, Pseudomonas syringae 1. INTRODUCTION Populus species are widely distributed and abundant in many different environments. A broad range of species and hybrids can be found as nursery crops grown for biomass production in short rotation coppice plantations and for reforestation and restoration purposes. In nurseries, plant material of the most poplar species is normally propagated with hardwood cuttings whereas aspen may be propagated from seeds. In poplar and aspen clones, established in a collection with more than 250 different genotypes, in nursery practice as well as in stock plant cultures necrosis and canker symptoms had appeared at 1 – 3 year-old shoots in North-Eastern Germany for some years. The injuries were characterized by ring-shaped necroses with constrictions of the shoot, canker formations and spontaneous cracking. The extend of disease symptoms like necroses formation and shoot cracking increased during the winter season and disrupted in early spring. This pattern was different from the known damages caused by the more common pathogens like Aplanobacter populi and Cryptodiaporthe populea. 162
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