Abstract
The study underscores the susceptibility of the wych elm Ulmus glabra to infection by Botryodiplodia hypodermia, the causal agent of elm canker. Mycelia of the fungus were implanted on saplings in two variants (scoring the bark surface and drilling holes in the wood) and compared with a control group. Botryodiplodia hypodermia was not found to have a statistically significant ability to cause dieback of elm saplings in short term. However, both infected groups (by scoring and drilling) reacted strongly to Botryodiplodia hypodermia implantation: this prevented the formation of callus tissue and thus the healing of the wound caused by the mycelium inoculation. Greyish-blue or dark tissue discolourations were noted above and below the infection site, although the fungus could not be isolated from these areas. The ability to block the formation of callus tissue wherever the bark has been damaged, leading to the appearance of tree canker (unhealed wounds), can favour secondary infections of shoots by other pathogenic fungi. The fungus, which can lead to elm dieback, is potential factor endangering elms in Europe.
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We thank anonymous reviewer for comments on the manuscript.
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This study was financially supported by the Ministry of Science and Higher Education of the Republic of Poland in frame of 2019 subvention funds for Faculty of Forestry, University of Agriculture in Krakow.
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Bartnik, C., Michalcewicz, J. & Ciach, M. Infection potential of Botryodiplodia hypodermia, the causal agent of elm canker. J Plant Pathol 104, 1123–1128 (2022). https://doi.org/10.1007/s42161-022-01108-z
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DOI: https://doi.org/10.1007/s42161-022-01108-z