First report of Sirococcus tsugae in Belgium
In Belgium, a group of approximately 10 Atlas cedar trees (Cedrus atlantica) showing severe shoot blight symptoms was observed in June 2018, in the province of Luxembourg. These affected trees presented a light brown to pink discolouration of the needles, as well as premature defoliation. A closer examination of the branches revealed necrosis of phloem tissues. Affected trees were growing in a forest environment and their diameter at breast height ranged from 45 to 55 cm. A fungus could be isolated from the margin of necrotic plant tissues. Laboratory studies (PCR, ITS sequencing, pathogenicity tests) confirmed the presence of Sirococcus tsugae (EPPO Alert List) in diseased cedar trees. This is the first time that S. tsugae is reported from Belgium. It is noted that the distribution of S. tsugae within Belgian forests and nurseries, as well as on amenity trees, requires further investigation and that surveys should also consider other host plants, such as other Cedrus or Tsuga species.
Sources
Schmitz S, Charlier A, Chandelier A (2018) First report of Sirococcus tsugae causing shoot blight on Cedrus atlantica in Belgium. New Disease Reports 38, 16. http://dx.doi.org/10.5197/j.2044-0588.2018.038.016