نتایج جستجو برای: quercus petraea
تعداد نتایج: 6971 فیلتر نتایج به سال:
Outbreaks of acute oak decline (AOD) have been documented in England from 2006. Both species of native oaks (Quercus robur and Quercus petraea) are affected. To complement isolation efforts for identification of putative causative biotic agents and increase our understanding of bacteria associated with oak tissue, five sites in England were chosen for this study. Samples of outer bark, inner ba...
Acute Oak Decline (AOD) is a new condition affecting both species of native oak, Quercus robur and Quercus petraea, in Great Britain. The decline is characterised by a distinctive set of externally visible stem symptoms; bark cracks that “weep” dark exudate are found above necrotic lesions in the inner bark. Emergence holes of the buprestid beetle, Agrilus biguttatus are often also seen on the ...
The consistency of visual assessment of tree defoliation, which represents the most widely used indicator for tree condition, has frequently been in the focus of scientific criticism. Thus, the objective of the present study was to examine the consistency of the defoliation data from the annual national training courses for the forest condition survey in Germany from 1992 to 2012. Defoliation a...
1 The indigenous oak species (Quercus spp.) of the Upper Rhine Valley have migrated to their 2 current distribution range in the area after the transition to the Holocene interglacial. Since 3 post-glacial recolonization, they have been subjected to ecological changes and human 4 impact. By using chloroplast microsatellite markers (cpSSRs), we provide detailed 5 phylogeographic information and ...
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